0001048268-21-000162 | 10-K | XBRL Viewer

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DEI Document - USD ($) $ in Thousands	12 Months Ended
DEI Document - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Dec. 01, 2021	Mar. 31, 2021
Entity Information [Line Items]
Entity Registrant Name	IES Holdings, Inc.
Document Type	10-K
Document Period End Date	Sep. 30, 2021
Entity File Number	001-13783
Entity Incorporation, State or Country Code	DE
Document Annual Report	true
Document Transition Report	false
Amendment Flag	false
Entity Central Index Key	0001048268
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--09-30
Entity Tax Identification Number	76-0542208
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	IESC
Security Exchange Name	NASDAQ
Entity Filer Category	Accelerated Filer
Entity Address, Address Line One	5433 Westheimer Road
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056
City Area Code	713
Local Phone Number	860-1500
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Common Stock, Shares Outstanding			20,702,565
Documents Incorporated by Reference	Certain information contained in the Proxy Statement for the 2022 Annual Meeting of Stockholders of the Registrant to be held on February 24, 2022, is incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Public Float				$ 450,900
Goodwill, Acquired During Period	$ 38,632	$ 10,117
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Residential [Member]
Entity Information [Line Items]
Goodwill, Acquired During Period	$ 35,151	$ 6,201

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 23,105	$ 53,577
Accounts receivable	286,707	213,016
Accounts and Other Receivables, Net, Current	41,341	40,878
Inventories	68,573	24,889
Costs and estimated earnings in excess of billings	43,389	29,937
Prepaid expenses and other current assets	21,065	9,153
Total current assets	484,180	371,450
Property and equipment, net	35,454	24,589
Goodwill	92,395	53,763
Intangible assets, net	85,619	39,357
Deferred tax assets	19,009	33,803
Operating right of use assets	42,916	31,786
Other non-current assets	7,049	5,780
Total assets	766,622	560,528
Accounts payable and accrued expenses	249,114	186,710
Billings in excess of costs and estimated earnings	62,486	55,739
Total current liabilities	311,600	242,449
Long-term debt	39,746	217
Operating long-term lease liabilities	28,649	20,530
Other non-current liabilities	16,080	12,215
Total liabilities	396,075	275,411
Noncontrolling interest	$ 24,594	$ 1,804
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred stock, value	$ 0	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	22,049,529	22,049,529
Common Stock, Shares, Outstanding	20,732,531	20,762,395
Common stock, value	$ 220	$ 220
Treasury Stock, Shares	1,316,998	1,287,134
Treasury stock, value	$ (29,300)	$ (24,499)
Additional paid-in capital	201,899	200,587
Retained earnings	173,134	107,005
Total stockholders' equity	345,953	283,313
Total liabilities and stockholders' equity	$ 766,622	$ 560,528

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 1,536,493	$ 1,190,856	$ 1,076,996
Cost of services	1,248,495	962,897	894,893
Gross profit	287,998	227,959	182,103
Selling, general and administrative expenses	202,251	170,911	140,575
Goodwill impairment expense		6,976	0
Contingent consideration	211	11	374
Loss (gain) on sale of assets	(47)	0	(52)
Operating income	85,583	50,083	41,850
Interest expense	962	777	1,857
Other (income) expense, net	(286)	12	(148)
Income from operations before income taxes	84,907	49,294	40,141
Provision for income taxes	16,231	8,740	6,663
Net income (loss)	68,676	40,554	33,478
Net (income) loss attributable to noncontrolling interest	(2,018)	1,045	(272)
Comprehensive income (loss) attributable to IES Holdings, Inc.	$ 66,658	$ 41,599	$ 33,206
Earnings (loss) per share, basic	$ 3.19	$ 1.96	$ 1.56
Earnings (loss) per share, diluted	$ 3.15	$ 1.94	$ 1.55
Weighted Average Number of Shares Outstanding, Basic	20,790,307	20,795,892	21,082,012
Weighted Average Number of Shares Outstanding, Diluted	21,086,432	21,092,410	21,315,245

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment
Stockholders' Equity Attributable to Parent, Beginning Balance at Sep. 30, 2018	$ 220,407		$ 220	$ 8,937	$ 196,810	$ 32,314
Shares, Issued, Beginning Balance at Sep. 30, 2018			22,049,529	843,993
Issuances under compensation plans	0			$ 5,942	5,942
Issuances under compensation plans, shares				501,797
Acquisition of treasury stock	(9,802)			$ (9,802)
Acquisition of treasury stock, shares				(564,822)
Options exercised	0			$ (314)	(314)
Options exercised, shares				22,500
Non-cash compensation	2,357				2,357
Decrease (increase) in noncontrolling interest	(80)					(80)
Net income (loss) attributable to IES Holdings, Inc.	33,206					33,206
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2019	246,248		$ 220	$ 12,483	192,911	65,600
Shares, Issued, Ending Balance at Sep. 30, 2019			22,049,529	884,518
Issuances under compensation plans	0			$ 1,708	(1,708)
Issuances under compensation plans, shares				120,197
Acquisition of treasury stock	$ (7,697)			$ (13,808)	6,111
Acquisition of treasury stock, shares	(263,160)			(528,563)
Options exercised	$ (34)			$ (84)	(50)
Options exercised, shares				5,750
Non-cash compensation	3,323				3,323
Cumulative Effect of New Accounting Principle	(194)					(194)
Decrease (increase) in noncontrolling interest						194
Net income (loss) attributable to IES Holdings, Inc.	41,599					41,599
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2020	$ 283,313		$ 220	$ 24,499	200,587	107,005
Shares, Issued, Ending Balance at Sep. 30, 2020	5,750		22,049,529	1,287,134
Issuances under compensation plans	$ 0			$ 2,737	2,737
Issuances under compensation plans, shares				140,660
Acquisition of treasury stock	$ (7,010)			$ (7,538)	528
Acquisition of treasury stock, shares	(124,205)			(170,524)
Options exercised	$ 0			$ 0	0
Options exercised, shares				0
Non-cash compensation	3,522				$ 3,522
Decrease (increase) in noncontrolling interest	(315)					(315)
Net income (loss) attributable to IES Holdings, Inc.	66,658					$ 66,658
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2021	$ 345,953	$ 214	$ 220				$ 214
Shares, Issued, Ending Balance at Sep. 30, 2021			22,049,529	1,316,998

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Statement of Cash Flows [Abstract]
Net income (loss)	$ 68,676	$ 40,554	$ 33,478
Bad debt expense		1,864	552
Deferred financing cost amortization	198	152	318
Depreciation and amortization	21,914	12,508	9,557
Loss (gain) on sale of assets	47	0	52
Non-cash compensation	3,522	3,323	2,357
Goodwill impairment expense		6,976	0
Deferred income taxes	11,724	5,122	5,681
Accounts receivable	(55,371)	(25,389)	(35,254)
Inventories	(30,517)	(2,822)	(684)
Costs and estimated earnings in excess of billings	(13,451)	435	1,586
Prepaid expenses and other current assets	(9,226)	(9,355)	(7,171)
Other non-current assets	703	510	(444)
Accounts payable and accrued expenses	30,623	20,122	22,472
Billings in excess of costs and estimated earnings	6,746	13,967	6,683
Other non-current liabilities	1,214	8,774	(459)
Net cash provided by operating activities	37,924	76,741	38,724
Purchases of property and equipment	7,401	4,745	6,300
Proceeds from sale of assets	295	104	502
Cash received (paid) in conjunction with business combinations	92,463	28,952	50
Net cash used in investing activities	(99,569)	(33,593)	(5,748)
Borrowings of debt	1,318,530	592,768	89,261
Repayments of debt	(1,278,204)	(592,756)	(119,508)
Finance lease payment	(648)	(215)	0
Payment for Contingent Consideration Liability, Financing Activities	0	0	(240)
Distribution to noncontrolling interests	(311)	(639)	(240)
Purchase of treasury stock	(7,006)	(7,697)	(9,802)
Issuance of shares	0	34	0
Net cash used in financing activities	31,173	(8,505)	(40,289)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(30,472)	34,643	(7,313)
CASH, CASH EQUIVALENTS and RESTRiCTED CASH, beginning of period	53,577	18,934	26,247
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period	23,105	53,577	18,934
Cash paid for interest	738	782	1,743
Cash paid for income taxes (net)	5,062	$ 323	$ 1,370
Payments for Repurchase of Redeemable Noncontrolling Interest	$ (1,188)

Business	12 Months Ended
Business	Sep. 30, 2021
Accounting Policies [Abstract]
Business Description and Basis of Presentation [Text Block]	1. BUSINESS Description of the Business IES Holdings, Inc. designs and installs integrated electrical and technology systems and provides infrastructure products and services across a variety of end markets, including data centers, residential housing and commercial and industrial facilities. Our operations are organized into four principal business segments, based upon the nature of our services: •Communications – Nationwide provider of technology infrastructure services, including the design, build, and maintenance of the communications infrastructure within data centers for co-location and managed hosting customers for both large corporations and independent businesses. •Residential – Regional provider of electrical installation services for single-family housing and multi-family apartment complexes, as well as heating, ventilation and air conditioning (HVAC) and plumbing installation services in certain markets. •Infrastructure Solutions – Provider of electro-mechanical solutions for industrial operations, including apparatus repair and custom-engineered products such as generator enclosures to be used in data centers and other industrial applications. •Commercial & Industrial – Provider of electrical and mechanical design, construction, and maintenance services to the commercial and industrial markets in various regional markets and nationwide in certain areas of expertise, such as the power infrastructure market and data centers. The words “IES”, the “Company”, “we”, “our”, and “us” refer to IES Holdings, Inc. and, except as otherwise specified herein, to our consolidated subsidiaries.

Summary of Significant Accounting Policies (Notes)

12 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies [Text Block]

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of IES Holdings, Inc. and its consolidated subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.

Asset Impairment

During the fiscal year ended September 30, 2021, the Company recorded no asset impairment charges. At September 30, 2020, we recorded an impairment charge of $6,976 to Goodwill related to our Commercial & Industrial segment. During the fiscal year ended September 30, 2019, the Company recorded no asset impairment charges. Please refer to Note 17, “Goodwill and Intangible Assets” for further discussion.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires the use of estimates and assumptions by management in determining the reported amounts of assets and liabilities, disclosures of contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Estimates are primarily used in our revenue recognition of construction in progress, fair value assumptions in accounting for business combinations and analyzing goodwill, intangible assets and long-lived asset impairments and adjustments, allowance for credit losses, stock-based compensation, reserves for legal matters, realizability of deferred tax assets, unrecognized tax benefits and self-insured claims liabilities and related reserves.

Cash and Cash Equivalents

We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.

Inventories

Inventories consist of raw materials, work in process, finished goods, and parts and supplies held for use in the ordinary course of business. Inventory is valued at the lower of cost or net realizable value generally using the historical average cost or first-in, first-out (FIFO) method. When circumstances dictate, we write down inventory to its estimated net realizable value based on assumptions about future demand, market conditions, plans for disposal, and physical condition of the product. Where shipping and handling costs on inventory purchases are borne by us, these charges are included in inventory and charged to cost of services upon use in our projects or the providing of services.

Property and Equipment

Additions of property and equipment are recorded at cost, and depreciation is computed using the straight-line method over the estimated useful life of the related asset. Leasehold improvements are capitalized and depreciated over the lesser of the life of the lease or the estimated useful life of the asset.

Expenditures for repairs and maintenance are charged to expense when incurred. Expenditures for major renewals and betterments, which extend the useful lives of existing property and equipment, are capitalized and depreciated. Upon retirement or disposition of property and equipment, the capitalized cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recognized in the statements of comprehensive income in the caption (gain) loss on sale of assets.

Goodwill

Goodwill attributable to each reporting unit is tested for impairment either by comparing the fair value of each reporting unit with its carrying value or by a qualitative assessment. These impairment tests are required to be performed at least annually. On an ongoing basis (absent any impairment indicators), we perform an impairment test annually using a measurement date of September 30. In evaluating goodwill for impairment, we have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is greater than its carrying value. If we determine that it is more likely than not that the carrying value of a reporting unit is greater than its fair value, then we perform an impairment test by calculating the fair value of the reporting unit and comparing this calculated fair value with the carrying value of the reporting unit.

We estimate the fair value of the reporting unit based on both a market approach and an income approach, using discounted estimated future cash flows. The market approach uses market multiples of enterprise value to earnings before interest, taxes, depreciation and amortization for comparable publicly traded companies. The income approach relies on significant estimates for future cash flows, projected long-term growth rates, and the weighted average cost of capital.

Intangible Assets

Intangible assets with definite lives are amortized over their estimated useful lives based on expected economic benefit with no residual value.

Debt Issuance Costs

Debt issuance costs are included as a reduction of our debt outstanding, or alternately classified within other non-current assets if we have no borrowings drawn on our credit facility at the balance sheet date, and are amortized to interest expense over the scheduled maturity of the debt. Amortization expense of debt issuance costs was $198, $152 and $318, respectively, for the years ended 2021, 2020 and 2019. Remaining unamortized capitalized debt issuance costs were $656 and $736 at September 30, 2021, and 2020, respectively.

Revenue Recognition

Revenue is recognized from a contract with a customer when: (i) it has approval and commitment from both parties, (ii) the rights of the parties are identified, (iii) payment terms are identified, (iv) the contract has commercial substance, and (v) collectability of consideration is probable. We consider the start of a project to be when the above criteria have been met and we have written authorization from the customer to proceed.

We recognize revenue on project contracts over time using the percentage of completion method. Project contracts generally provide that customers accept completion of progress to date and compensate us for services rendered measured in terms of units installed, hours expended or some other measure of progress. We recognize revenue on both signed contracts and change orders. A discussion of our treatment of claims and unapproved change orders is described later in this section. Percentage of completion for construction contracts is measured principally by the percentage of costs incurred and accrued to date for each contract to the estimated total cost for each contract at completion. We generally consider contracts to be substantially complete upon departure from the work site and acceptance by the customer. Contract costs include all direct material, labor and insurance costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation costs. Changes in job performance, job

conditions, estimated contract costs and profitability and final contract settlements can result in change orders under which the customer agrees to pay additional contract price. Revisions can also result in claims we might make against the customer to recover additional costs that have not been resolved through change orders with the customer. We do not recognize revenue or margin based on change orders or claims if it is probable such revenue will be reversed. The amount of revenue associated with unapproved change orders and claims was immaterial for the years ended September 30, 2021, 2020 and 2019. Provisions for total estimated losses on uncompleted contracts are made in the period in which such losses are determined. The balances billed but not paid by customers pursuant to retainage provisions in project contracts are typically due upon completion of the contracts and acceptance by the customer. Based on our experience, the retention balance at each balance sheet date will be collected within the subsequent fiscal year.

Certain divisions in the Residential and Infrastructure Solutions segments recognize revenue as of a point-in-time at the completion of the contract ("completed contract") because the duration of their contracts is short in nature. We recognize revenue on completed contracts when the project is complete and billable to the customer. Provisions for estimated losses on these contracts are recorded in the period such losses are determined.

Accounts Receivable and Allowance for Credit Losses

As described below under “Accounting Standards Recently Adopted”, we adopted the new accounting standard for measuring credit losses effective October 1, 2020. We record accounts receivable for all amounts billed and not collected and amounts for which we have an unconditional right to bill our customers. Additionally, we provide an allowance for credit losses based on historical company-specific uncollectable accounts, as well as current and expected market conditions. From time to time, we establish additional allowance for credit losses for financial asset balances with specific customers where collectability has been determined to be improbable based on specific facts and circumstances. Such allowances are established as deemed necessary in the period such determination is made. As is common in our industry, some of these receivables are in litigation or require us to exercise our contractual lien rights in order to collect. Our allowance for credit losses at September 30, 2021 and 2020 was $2,387 and $2,613, respectively.

Comprehensive Income (Loss)

Comprehensive income (loss) includes all changes in equity during a period except those resulting from investments by and distributions to stockholders.

Income Taxes

We follow the liability method of accounting for income taxes. Under this method, deferred income tax assets and liabilities are recorded for the future income tax consequences of temporary differences between the financial reporting and income tax bases of assets and liabilities, and are measured using enacted tax rates and laws.

We regularly evaluate valuation allowances established for deferred tax assets for which future realization is uncertain. We perform this evaluation on a quarterly basis. The estimation of required valuation allowances includes estimates of future taxable income. In assessing the realizability of deferred tax assets, we must consider whether it is more likely than not some portion, or all, of the deferred tax assets will not be realized. We consider all available evidence, both positive and negative, in determining whether a valuation allowance is required. At September 30, 2021, we concluded, based upon the assessment of positive and negative evidence, that it is more likely than not that the Company will generate sufficient taxable income within the applicable net operating loss ("NOL") carryforward periods to realize its net deferred tax assets of $19,009. We considered the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in making this assessment. If actual future taxable income is different from these estimates, our results could be affected.

We record reserves for income taxes related to certain tax positions when management considers it more likely than not that additional taxes may be due in excess of amounts reflected on income tax returns filed. When recording these reserves, we assume that taxing authorities have full knowledge of the position and all relevant facts. We continually review exposure to additional tax obligations, and as further information is known or events occur, changes in tax reserves may be recorded. To the extent interest and penalties may be assessed by taxing authorities on any underpayment of income tax, such amounts have been accrued and included in the provision for income taxes.

Risk Management

We retain the risk for workers’ compensation, employer’s liability, automobile liability, construction defects, general liability and employee group health claims, as well as pollution coverage, resulting from uninsured deductibles per accident or occurrence which are generally subject to annual aggregate limits. Our general liability program provides coverage for bodily injury and property damage. In many cases, we insure third parties, including general contractors, as additional insureds under our insurance policies. Losses are accrued based upon our known claims incurred and an estimate of claims incurred but not reported. Each year, we compile our historical data pertaining to the insurance experiences and actuarially develop the ultimate loss associated with our insurance

programs other than pollution coverage for our Infrastructure Solutions segment. We believe that the actuarial valuation provides the best estimate of the ultimate losses to be expected under these programs.

The undiscounted ultimate losses of our workers’ compensation, auto and general liability insurance reserves at September 30, 2021 and 2020, were $3,266 and $3,886, respectively. Based on historical payment patterns, we expect payments of undiscounted ultimate losses to be made as follows:


Year Ending September 30:
	2022	$	1,047
	2023		714
	2024		452
	2025		285
	2026		167
	Thereafter		601
Total		$	3,266

We elect to discount the ultimate losses above to present value using an approximate risk-free rate over the average life of our insurance claims. For the years ended September 30, 2021 and 2020, the discount rate used was 1.0 percent and 0.3 percent, respectively. The present value of all insurance reserves for the workers’ compensation, auto and general liability recorded at September 30, 2021 and 2020 was $3,234 and $3,832, respectively. Our undiscounted reserves for employee group health claims at September 30, 2021 and 2020 were $2,553 and $2,422, respectively, and are anticipated to be resolved within the year ending September 30, 2022.

We had letters of credit totaling $4,327 outstanding at September 30, 2021 to collateralize certain of our high deductible insurance obligations.

Realization of Long-Lived Assets

We evaluate the recoverability of property and equipment and other long-lived assets as facts and circumstances indicate that any of those assets might be impaired. If an evaluation is required for our assets we plan to hold and use, the estimated future undiscounted cash flows associated with the asset are compared to the asset’s carrying amount to determine if an impairment of such property has occurred. The effect of any impairment would be to expense the difference between the fair value of such property and its carrying value. Estimated fair values are determined based on expected future cash flows discounted at a rate we believe incorporates the time value of money, the expectations about future cash flows and an appropriate risk premium.

For the years ended September 30, 2021 and 2019, no indicators of impairments were identified, and no impairment charges were recorded. At September 30, 2020, we performed an asset impairment test for all long-lived assets within our Commercial & Industrial segment and determined no impairment charge was necessary.

Risk Concentration

Financial instruments, which potentially subject us to concentrations of credit risk, consist principally of cash deposits and accounts receivable. Through delayed payment terms, we at times grant credit, usually without collateral, to our customers, who are generally large public companies, contractors and homebuilders throughout the United States. Consequently, we are subject to potential credit risk related to changes in business and economic factors throughout the United States, specifically within the construction, homebuilding and mission critical facility markets. However, we are entitled to payment for work performed and generally have certain lien rights in that work. Further, management believes that its contract acceptance, billing and collection policies are adequate to manage potential credit risk. We routinely maintain cash balances in financial institutions in excess of federally insured limits. We periodically assess the financial condition of these institutions where these funds are held and believe the credit risk is minimal. We maintain the majority of our cash and cash equivalents in money market mutual funds. There can be no assurance, however, that we will not be adversely affected by credit risks we face.

No single customer accounted for more than 10% of our consolidated revenues or accounts receivable for the years ended September 30, 2021, 2020 and 2019.

Fair Value of Financial Instruments

Our financial instruments consist of cash and cash equivalents, accounts receivable, accounts payable, and a loan agreement. We believe that the carrying value of financial instruments approximates their fair value due to their short-term nature. The carrying value of our debt approximates fair value, as debt incurs interest at a variable rate.

Deferred Compensation Plans

The Company maintains a rabbi trust to fund certain deferred compensation plans. The securities held by the trust are classified as trading securities. The investments are recorded at fair value and are classified as other non-current assets in the accompanying Consolidated Balance Sheets as of September 30, 2021 and 2020. The changes in fair values are recorded as a component of other income (expense) in the Consolidated Statements of Comprehensive Income (Loss).

The corresponding deferred compensation liability is included in other non-current liabilities on the Consolidated Balance Sheets and changes in this obligation are recognized as adjustments to compensation expense in the period in which they are determined.

Noncontrolling Interest

In connection with our acquisitions of Edmonson Electric, LLC ("Edmonson") and Bayonet Plumbing, Heating & Air-Conditioning, LLC ("Bayonet") in fiscal 2021, NEXT Electric, LLC ("NEXT") in fiscal 2017, and STR Mechanical, LLC ("STR") in fiscal 2016, we acquired an 80 percent interest in each of the entities, with the remaining 20 percent interest in each such entity being retained by the respective third party sellers. The interests retained by those third party sellers are identified on our Consolidated Balance Sheets as noncontrolling interest, classified outside of permanent equity. Under the terms of each entity’s operating agreement, after five years from the date of the acquisition, we may elect to purchase, or the third party seller may require us to purchase, part or all of the remaining 20 percent interest in the applicable entity. The purchase price is variable, based on a multiple of earnings as defined in the operating agreements. Therefore, this noncontrolling interest is carried at the greater of the balance determined under Accounting Standards Codification (“ASC”) 810 and the redemption amounts assuming the noncontrolling interests were redeemable at the balance sheet date. During the year ended September 30, 2021, we acquired the noncontrolling interest in STR for $1,188. If all of the noncontrolling interests remaining outstanding at September 30, 2021 had been redeemable at that date, the redemption amount would have been $18,262. For the year ended September 30, 2021, we recorded a decrease to Retained Earnings of $315 to increase the carrying amount of noncontrolling interest in NEXT and STR to their redemption amounts. For the year ended September 30, 2020, we recorded a decrease to Retained Earnings of $194 to increase the carrying amount of noncontrolling interest in NEXT to its redemption amount.

Leases

We enter into various contractual arrangements for the right to use facilities, vehicles and equipment. We evaluate whether each of these arrangements contains a lease and classify all identified leases as either operating or finance. If the arrangement is subsequently modified, we re-evaluate our classification. The lease term generally ranges from two to ten years for facilities and three to five years for vehicles and equipment. Our lease terms may include the exercise of renewal or termination options when it is reasonably certain these options will be exercised. Our lease agreements do not contain any material residual value guarantees or restrictive covenants.

Upon commencement of the lease, we recognize a lease liability and corresponding right-of-use ("ROU") asset for all leases with an initial term greater than twelve months. Lease liabilities represent the present value of our future lease payments over the expected lease term. As most of our leases do not provide an implicit rate, we generally use our incremental borrowing rate as the discount rate in calculating the present value of the lease payments. The incremental borrowing rate is determined by identifying a synthetic credit rating for the consolidated company, where treasury functions are centrally managed, and adjusting the interest rates from associated indexes for differences in credit risk and interest rate risk. We have elected to combine the lease and nonlease components in the recognition of our lease liabilities across all classes of underlying assets. ROU assets represent our right to control the use of the leased asset during the lease and are recognized in an amount equal to the lease liability with adjustments for prepaid or accrued rent, lease incentives or unamortized initial direct costs. Costs associated with ROU assets are recognized on a straight-line basis over the term of the lease. Our lease assets are tested for impairment in the same manner as long-lived assets used in operations.

Certain lease contracts include obligations to pay for other services, such as operations and maintenance. Where the costs of these services can be identified as fixed or fixed-in-substance, the costs are included as part of the future lease payments. If the cost is not fixed at the inception of the lease, the cost is recorded as a variable cost in the period incurred.

Accounting Standards Not Yet Adopted

In December 2019, the Financial Accounting Standards Board ("FASB") issued Accounting Standard Update No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” This standard simplifies the accounting for income taxes by eliminating certain exceptions to the guidance in Topic 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The standard also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. This update is effective for fiscal years beginning after December 15, 2020 and for interim periods within that year. Early adoption is permitted. We adopted this standard as of October 1, 2021, and do not expect it to have a material impact on our Consolidated Financial Statements.

Accounting Standards Recently Adopted

In June 2016, FASB issued Accounting Standard Update No. 2016-13, Financial Instruments – Credit Losses (“ASU 2016-13”), which requires companies to consider historical experiences, current market conditions and reasonable and supportable forecasts in the measurement of expected credit losses, with further clarifications made in April 2019 and May 2019 with the issuances of Accounting Standard Updates No. 2019-04 and 2019-05. This update is effective for fiscal years beginning after December 15, 2019 and for interim periods within those fiscal years. We adopted this standard on October 1, 2020, using a modified retrospective transition method through a cumulative-effect adjustment to beginning retained earnings in the period of adoption. As a result, we recorded an increase in the Allowance for Credit Losses of $284, an increase to Deferred Tax Assets of $70, and a decrease to Retained Earnings of $214.

ASU 2016-13 requires the recognition of expected credit losses on financial assets measured at amortized cost basis. In calculating our expected credit losses, we considered trade receivables, retainage, and costs and estimated earnings in excess of billings, all of which constitute a homogenous portfolio, and therefore, to measure the expected credit loss, they have been grouped together.

We have elected to calculate an expected credit loss based on loss rates from historical data. Each segment groups financial assets with similar risk characteristics and collectively assesses the expected credit losses. If an individual asset experiences credit deterioration to the extent the credit risk is no longer characteristic of the other assets in the group, it will be analyzed individually. The loss rates for our portfolios include our history of credit loss expense, the aging of our receivables, our expectation of payments and adjustment for forward-looking factors specific to the macroeconomic trends in the U.S. construction market.

Activity in our allowance for credit losses consists of the following:


	Year Ended September 30,
	2021		2020
Balance at beginning of period	$	2,613	$	1,184
Additions to costs and expenses, inclusive of ASU 2016-13 adoption adjustment	1,216		1,864
Deductions for uncollectible receivables written off, net of recoveries	(1,442)		(435)
Balance at end of period	$	2,387	$	2,613

Other than trade receivables due in one year or less, we do not have any other financial assets that are past due or are on non-accrual status.

In August 2018, the FASB issued Accounting Standard Update No. 2018-13, Fair Value Measurement Disclosure Framework (“ASU 2018-13”), to modify certain disclosure requirements for fair value measurements. Under the new guidance, registrants will need to disclose weighted average information for significant unobservable inputs for all Level 3 fair value measurements. The guidance does not specify how entities should calculate the weighted average, but requires them to explain their calculation. The new guidance also requires disclosing the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements of instruments held at the end of the reporting period. This guidance is effective for fiscal years beginning after December 15, 2019 and for interim periods within those fiscal years. We adopted this standard on October 1, 2020, with no impact on our Consolidated Financial Statements.

In February 2016, the FASB issued Accounting Standard Update No. 2016-02, Leases (“ASU 2016-02”). Under ASU 2016-02, lessees need to recognize a ROU asset and a lease liability on their balance sheets for all leases, other than those that meet the definition of a short-term lease. For income statement purposes, leases must be classified as either operating or finance. Operating leases result in straight-line expense, while finance leases are accounted for similar to capital leases under the previous lease accounting standard. We adopted ASU 2016-02 on October 1, 2019 using a modified retrospective transition approach. Using the optional transition method allowed under Accounting Standard Update No. 2018-11, prior period amounts were not adjusted retrospectively and continue to be reported using the previous accounting standards in effect for the period presented. We elected to utilize all of the available practical expedients with the exception of the practical expedient permitting the use of hindsight when determining the lease term and assessing impairment of ROU assets. Therefore, we did not reassess whether any of our existing or expired contracts contained leases or the classification of or initial direct costs included in our existing or expired leases.

The adoption of ASU 2016-02 resulted in the recognition of ROU assets of approximately $32,434 and operating lease liabilities of approximately $32,237 on our Consolidated Balance Sheets at the adoption date. The difference between the ROU assets and lease liabilities was primarily due to previously accrued rent expense relating to periods prior to October 1, 2019. The adoption did not have a significant impact on our Consolidated Statements of Comprehensive Income or Cash Flows. See Note 9, “Leases” for additional discussion of our lease accounting policies and expanded disclosures.

In June 2018, the FASB issued Accounting Standard Update No. 2018-07, Compensation—Stock Compensation (“ASU 2018-07”), to simplify the accounting for share-based payments to nonemployees by aligning it with the accounting for share-based payments for employees, with certain exceptions. Under the new guidance, the cost for nonemployee awards may be lower and less volatile than under current GAAP because the measurement generally will occur earlier and will be fixed at the grant date. This update was adopted as of October 1, 2019 with no impact to our financial statements.

Controlling Shareholder	12 Months Ended
Controlling Shareholder	Sep. 30, 2021
Risks and Uncertainties [Abstract]
Controlling Shareholder [Text Block]	3. CONTROLLING SHAREHOLDER Tontine Associates, L.L.C. ("Tontine Associates"), together with its affiliates (collectively, "Tontine") is the Company's controlling shareholder, owning approximately 56 percent of the Company’s outstanding common stock as of December 1, 2021, based on Form 4 filed by Tontine with the SEC on November 18, 2021. Accordingly, Tontine has the ability to exercise significant control over our affairs, including the election of directors and most actions requiring the approval of shareholders. While Tontine is subject to certain restrictions under federal securities laws on sales of its shares as an affiliate, the Company has filed a shelf registration statement to register all of the shares of IES common stock owned by Tontine at the time of registration. As long as the shelf registration statement remains effective and the Company remains eligible to use it, Tontine has the ability to resell any or all of its registered shares from time to time in one or more offerings, as described in the shelf registration statement and in any prospectus supplement filed in connection with an offering pursuant to the shelf registration statement. Should Tontine sell or otherwise dispose of all or a portion of its position in IES, a change in ownership of IES could occur. A change in ownership, as defined by Internal Revenue Code Section 382, could reduce the availability of the Company’s NOLs for federal and state income tax purposes. Furthermore, a change of control would trigger the change of control provisions in a number of our material agreements, including our credit agreement, bonding agreements with our sureties and our executive severance plan. The Company previously had in place a tax benefit protection plan (the “NOL Rights Plan”), designed to deter an acquisition of the Company's stock in excess of a threshold amount that could trigger a change in ownership within the meaning of Internal Revenue Code Section 382. However, on May 7, 2021, we amended the NOL Rights Plan, accelerating the expiration of the plan from December 31, 2021 to May 21, 2021. As a result of this amendment, the NOL Rights Plan has now expired. Jeffrey L. Gendell was appointed as Chief Executive Officer of the Company effective October 1, 2020, having served as the Company's Interim Chief Executive Officer since July 31, 2020. Mr. Gendell also serves as Chairman of the Board of Directors, a position he has held since November 2016. He is the managing member and founder of Tontine, and the brother of David B. Gendell, who has served as a member of our Board of Directors since February 2012, and who previously served as Interim Director of Operations from November 2017 to January 2019, as Vice Chairman of the Board from November 2016 to November 2017 and as Chairman of the Board from January 2015 to November 2016. David B. Gendell was an employee of Tontine from 2004 until December 31, 2017. The Company is party to a sublease agreement with Tontine Associates for corporate office space in Greenwich, Connecticut. The sublease extends through February 27, 2023, with monthly payments due in the amount of approximately $8. Payments by the Company are at a rate consistent with that paid by Tontine Associates to its landlord. On December 6, 2018, the Company entered into a Board Observer Letter Agreement (the "Observer Agreement") with Tontine Associates, in order to assist Tontine in managing its investment in the Company. Subject to the terms and conditions set forth in the Observer Agreement, the Company granted Tontine the right, at any time that Tontine holds at least 20% of the outstanding common stock of the Company, to appoint a representative to serve as an observer to the Board (the “Board Observer”). The Board Observer, who must be reasonably acceptable to those members of the Board who are not affiliates of Tontine, shall have no voting rights or other decision making authority. Subject to the terms and conditions set forth in the Observer Agreement, so long as Tontine has the right to appoint a Board Observer, the Board Observer will have the right to attend and participate in meetings of the Board and the committees thereof, subject to confidentiality requirements, and to receive reimbursement for reasonable out-of-pocket expenses incurred in his or her capacity as a Board Observer and such rights to coverage under the Company’s directors’ and officers’ liability insurance policy as are available to the Company’s directors.

Revenue Recognition

12 Months Ended

Sep. 30, 2021

Revenue Recognition and Deferred Revenue [Abstract]

Revenue from External Customers by Products and Services [Table Text Block]

4. REVENUE RECOGNITION

Contracts

Our revenue is derived from contracts with customers, and we determine the appropriate accounting treatment for each contract at its inception. Our contracts primarily relate to electrical and mechanical contracting services, technology infrastructure products and services, and electro-mechanical solutions for industrial operations. Revenue is earned based upon an agreed fixed price or actual costs incurred plus an agreed upon percentage.

We account for a contract when: (i) it has approval and commitment from both parties, (ii) the rights of the parties are identified, (iii) payment terms are identified, (iv) the contract has commercial substance, and (v) collectability of consideration is probable. We consider the start of a project to be when the above criteria have been met and we have written authorization from the customer to proceed.

Performance Obligations

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied.

We recognize revenue over time for the majority of the services we perform as (i) control continuously transfers to the customer as work progresses at a project location controlled by the customer and (ii) we have the right to bill the customer as costs are incurred. Within our Infrastructure Solutions segment, we often perform work inside our own facilities, where control does not continuously transfer to the customer as work progresses. In such cases, we evaluate whether we have the right to bill the customer as costs are incurred. Such assessment involves an evaluation of contractual termination clauses. Where we have a contractual right to payment for work performed to date, we recognize revenue over time. If we do not have such a right, we recognize revenue upon completion of the contract, when control of the work transfers to the customer.

For fixed price arrangements, we use the percentage of completion method of accounting under which revenue recognized is measured principally by the costs incurred and accrued to date for each contract as a percentage of the estimated total cost for each contract at completion. Contract costs include all direct material, labor and indirect costs related to contract performance. Changes in job performance, job conditions, estimated contract costs and profitability and final contract settlements may result in revisions to costs and income, and the effects of these revisions are recognized in the period in which the revisions are determined. Provisions for estimated losses on uncompleted contracts are made in the period in which such losses are determined. This measurement and comparison process requires updates to the estimate of total costs to complete the contract, and these updates may include subjective assessments and judgments.

Variable Consideration

The transaction price for our contracts may include variable consideration, which includes changes to transaction price for approved and unapproved change orders, claims and incentives. Change orders, claims and incentives are generally not distinct from the existing contract due to the significant integration service provided in the context of the contract and are accounted for as a modification of the existing contract and performance obligation. We estimate variable consideration for a performance obligation at the probability weighted value we expect to receive (or the most probable amount we expect to incur in the case of liquidated damages, if any), utilizing estimation methods that best predict the amount of consideration to which we will be entitled (or will be incurred in the case of liquidated damages, if any). We include variable consideration in the estimated transaction price to the extent it is probable that a significant reversal of cumulative revenue recognized will not occur or when the uncertainty associated with the variable consideration is resolved. Our estimates of variable consideration and determination of whether to include estimated amounts in transaction price are based largely on an assessment of our anticipated performance and all information (historical, current and forecasted) that is reasonably available to us. The effect of variable consideration on the transaction price of a performance obligation is recognized as an adjustment to revenue on a cumulative catch-up basis. To the extent unapproved change orders and claims reflected in transaction price (or accounted for as a reduction of the transaction price in the case of liquidated damages) are not resolved in our favor, or to the

extent incentives reflected in transaction price are not earned, there could be reductions in, or reversals of, previously recognized revenue.

Disaggregation of Revenue

We disaggregate our revenue from contracts with customers by activity and contract type, as these categories reflect how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors. Our consolidated 2021, 2020, and 2019 revenue was derived from the following activities. See details in the following tables:


	Year Ended September 30,
	2021		2020		2019
Communications	$	445,968	$	395,141	$	321,246
Residential
Single-family	454,449		239,140		212,358
Multi-family and Other	232,898		172,650		100,978
Total Residential	687,347		411,790		313,336
Infrastructure Solutions
Industrial Services	44,427		40,701		48,948
Custom Power Solutions	102,553		87,678		87,842
Total Infrastructure Solutions	146,980		128,379		136,790
Commercial & Industrial	256,198		255,546		305,624
Total Revenue	$	1,536,493	$	1,190,856	$	1,076,996


	Year Ended September 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	327,496	$	687,347	$	139,532	$	243,546	$	1,397,921
Time-and-material		118,472		—		7,448		12,652		138,572
Total revenue		$	445,968	$	687,347	$	146,980	$	256,198	$	1,536,493


	Year Ended September 30, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	309,567	$	411,790	$	121,922	$	241,864	$	1,085,143
Time-and-material		85,574		—		6,457		13,682		105,713
Total revenue		$	395,141	$	411,790	$	128,379	$	255,546	$	1,190,856

	Year Ended September 30, 2019
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	229,143	$	313,336	$	129,096	$	286,319	$	957,894
Time-and-material		92,103		—		7,694		19,305		119,102
Total revenue		$	321,246	$	313,336	$	136,790	$	305,624	$	1,076,996

Accounts Receivable

Accounts receivable include amounts which we have billed or have an unconditional right to bill our customers. As of September 30, 2021, accounts receivable included $20,445 of unbilled receivables for which we have an unconditional right to bill.

Contract Assets and Liabilities

Project contracts typically provide for a schedule of billings on percentage of completion of specific tasks inherent in the fulfillment of our performance obligation(s). The schedules for such billings usually do not precisely match the schedule on which costs are incurred. As a result, contract revenue recognized in the statement of operations can and usually does differ from amounts that can be billed to the customer at any point during the contract. Amounts by which cumulative contract revenue recognized on a contract as of a given date exceeds cumulative billings and unbilled receivables to the customer under the contract are reflected as a current asset in our Consolidated Balance Sheets under the caption “Costs and estimated earnings in excess of billings”. Amounts by which cumulative billings to the customer under a contract as of a given date exceed cumulative contract revenue recognized are reflected as a current liability in our Consolidated Balance Sheets under the caption “Billings in excess of costs and estimated earnings”.

During the years ended September 30, 2021 and 2020, we recognized revenue of $47,906 and $34,035 related to our contract liabilities at October 1, 2020 and 2019, respectively.

We did not have any impairment losses recognized on our receivables or contract assets for the years ended September 30, 2021, 2020, or 2019.

Remaining Performance Obligations

Remaining performance obligations represent the unrecognized revenue value of our contract commitments. New awards represent the total expected revenue value of new contract commitments undertaken during a given period, as well as additions to the scope of existing contract commitments. Our new performance obligations vary significantly each reporting period based on the timing of our major new contract commitments. At September 30, 2021, we had remaining performance obligations of $713,274. The Company expects to recognize revenue on approximately $650,500 of the remaining performance obligations over the next 12 months, with the remaining recognized thereafter.

For the year ended September 30, 2021, net revenue recognized from our performance obligations satisfied in previous periods was not material.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

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+ Details

Property and Equipment (Notes)

12 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

5. PROPERTY AND EQUIPMENT

Property and equipment consists of the following:


	Estimated Useful Lives in Years			Year Ended September 30,
				2021		2020
Land	N/A			$	1,436	$	1,436
Buildings and improvements	5	-	20	15,445		14,378
Machinery and equipment	3	-	10	48,443		32,695
Information systems	2	-	8	8,555		8,496
Furniture and fixtures	5	-	7	1,571		1,746
				$	75,450	$	58,751
Less-Accumulated depreciation				(41,308)		(34,544)
Construction in progress				1,312		382
Property and equipment, net				$	35,454	$	24,589

Depreciation expense was $8,090, $6,084 and $5,607, respectively, for the years ended September 30, 2021, 2020 and 2019.

Per Share Information

12 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

6. PER SHARE INFORMATION

Basic earnings per share is calculated as income (loss) available to common stockholders, divided by the weighted average number of common shares outstanding during the period. If the effect is dilutive, participating securities are included in the computation of basic earnings per share. Our participating securities do not have a contractual obligation to share in the losses in any given period. As a result, these participating securities will not be allocated any losses in the periods of net losses, but will be allocated income in the periods of net income using the two-class method.

The following table reconciles the components of the basic and diluted earnings per share for the years ended September 30, 2021, 2020 and 2019:


	Year Ended September 30,
	2021		2020		2019
Numerator:
Net income attributable to IES Holdings, Inc.	$	66,658	$	41,599	$	33,206
Increase in noncontrolling interest	(315)		(194)		—
Net income attributable to restricted shareholders of IES Holdings, Inc.	(56)		(575)		(256)
Net income attributable to common shareholders of IES Holdings, Inc.	$	66,287	$	40,830	$	32,950

Denominator:
Weighted average common shares outstanding — basic	20,790,307		20,795,892		21,082,012
Effect of dilutive stock options and non-vested securities	296,125		296,518		233,233
Weighted average common and common equivalent shares outstanding — diluted	21,086,432		21,092,410		21,315,245

Earnings per share attributable to common shareholders of IES Holdings, Inc.:
Basic	$	3.19	$	1.96	$	1.56
Diluted	$	3.15	$	1.94	$	1.55

For the years ended September 30, 2021, 2020, and 2019, the average price of our common shares exceeded the exercise price of outstanding options; therefore, outstanding stock options were included in the computation of diluted earnings per share.

Detail of Certain Balance Sheet Accounts (Notes)

12 Months Ended

Sep. 30, 2021

Detail of Certain Balance Sheet Accounts [Abstract]

Detail Of Certain Balance Sheet Accounts [Text Block]

7. DETAIL OF CERTAIN BALANCE SHEET ACCOUNTS

Accounts payable and accrued expenses consist of the following:


	Year Ended September 30,
	2021		2020
Accounts payable, trade	$	136,967	$	93,315
Accrued compensation and benefits	61,109		53,933
Accrued insurance liabilities	5,787		6,254
Current operating lease liabilities	13,973		11,056
Other accrued expenses	31,278		22,152
	$	249,114	$	186,710

Other non-current assets are comprised of the following:


	Year Ended September 30,
	2021		2020
Executive Savings Plan assets	$	937	$	766
Securities and equity investments	10		—
Right of use asset - finance leases	3,927		1,600
Other	2,175		3,414
Total	$	7,049	$	5,780

Debt

12 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt Disclosure [Text Block]

8. DEBT

Debt consists of the following:


	Year Ended September 30,
	2021		2020
Revolving loan (long-term debt)	$	40,339	$	12
Debt issuance costs (1)	(656)		—
Other long-term debt	63		205
Total debt	$	39,746	$	217

(1) At September 30, 2020, the remaining unamortized debt issuance costs of $736, were reclassified to Other non-current assets on the Consolidated Balance Sheets.

At September 30, 2021, we had $40,339 of outstanding borrowings, $4,527 in outstanding letters of credit and $55,134 of availability under our revolving credit facility with Wells Fargo Bank, N.A. ("Wells Fargo"). Following the amendment discussed below of our Prior Credit Agreement (as defined below) on December 2, 2021, all amounts outstanding under our revolving credit facility are due and payable in September 2026, upon expiration of our revolving credit facility, and all amounts described as available are available without triggering our financial covenants under the Amended Credit Agreement (as defined below).

The interest rate on outstanding borrowings under our revolving credit facility was 1.38% at September 30, 2021. For the years ended September 30, 2021, 2020 and 2019, we incurred interest expense of $962, $777 and $1,857, respectively.

The Revolving Credit Facility

We maintain a revolving credit facility pursuant to an agreement with Wells Fargo (as amended, the "Prior Credit Agreement"). On December 2, 2021, we amended the Prior Credit Agreement (the "Ninth Amendment" and the Prior Credit Agreement as so amended, the "Amended Credit Agreement") to, among other things, increase the size of the facility from $100,000 to $125,000, reduce our required minimum Liquidity (as defined in the Amended Credit Agreement) from $20,000 to $12,500, and extend the maturity date from September 30, 2024 to September 30, 2026. Please see Note 20 - "Subsequent Events" for further information about the terms of the Ninth Amendment.

Terms of the Prior Credit Agreement

The Prior Credit Agreement contains customary affirmative, negative and financial covenants, as well as customary events of default.

As of September 30, 2021, we were in compliance with the financial covenants in effect as of that date under the Prior Credit Agreement, requiring that we maintain:

• a Fixed Charge Coverage Ratio (as defined in the Prior Credit Agreement), measured quarterly on a trailing four-quarter basis at the end of each quarter, of at least 1.1 to 1.0; and

• minimum Liquidity of at least twenty percent (20%) of the Maximum Revolver Amount (as defined in the Prior Credit Agreement), or $20,000; with, for purposes of this covenant, at least fifty percent (50%) of our Liquidity comprised of Excess Availability (as defined in the Prior Credit Agreement).

At September 30, 2021, our Liquidity was $78,239, our Excess Availability was $55,134 (or greater than 50% of minimum Liquidity), and our Fixed Charge Coverage Ratio was 12.0:1.0.

There was no change to the Fixed Charge Coverage Ratio covenant under the Ninth Amendment. The Ninth Amendment reduced the minimum Liquidity requirement from twenty percent (20%) to ten percent (10%) of the Maximum Revolver Amount, or $12,500. If in the future our Liquidity falls below the amount required by the Amended Credit Agreement (or Excess Availability falls below 50% of our minimum Liquidity), our Fixed Charge Coverage Ratio is less than 1.1:1.0, or if we otherwise fail to perform or otherwise comply with certain of our covenants or other agreements under the Amended Credit Agreement, it would result in an event of default under the Amended Credit Agreement, which could result in some or all of any indebtedness we may take on becoming immediately due and payable.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Leases (Notes)

12 Months Ended

Sep. 30, 2021

Leases [Abstract]

Lessee, Finance Leases

9. LEASES

We enter into various contractual arrangements for the right to use facilities, vehicles and equipment. The lease term generally ranges from two to ten years for facilities and three to five years for vehicles and equipment. Our lease terms may include the exercise of renewal or termination options when it is reasonably certain these options will be exercised. Our lease agreements do not contain any material residual value guarantees or restrictive covenants.

Current operating and finance liabilities of $13,973 and $1,033, respectively, were included in "Accounts payable and accrued expenses" in the Consolidated Balance Sheets as of September 30, 2021. Non-current finance lease liabilities and finance lease right-of-use assets were included in the "Other non-current liabilities" and "Other non-current assets", respectively, in the Consolidated Balance Sheets.

The maturities of our lease liabilities as of September 30, 2021, are as follows:


	Operating Leases		Finance Leases		Total
2022	$	3,840	$	266	$	4,106
2023	13,481		1,055		14,536
2024	9,466		1,043		10,509
2025	6,430		999		7,429
2026	4,632		715		5,347
Thereafter	9,411		181		9,592
Total undiscounted lease payments	$	47,260	$	4,259	$	51,519
Less: imputed interest	4,637		354		4,991
Present value of lease liabilities	$	42,623	$	3,905	$	46,528

The total future undiscounted cash flows related to lease agreements committed to but not yet commenced as of September 30, 2021, is $7,296.

Lease cost recognized in our Consolidated Statements of Comprehensive Income is summarized as follows:


	Year Ended September 30,
	2021		2020
Operating lease cost	$	13,405	$	12,910
Finance lease cost
Amortization of lease assets	634		203
Interest on lease liabilities	119		47
Finance lease cost	753		250
Short-term lease cost	1,575		1,163
Variable lease cost	1,286		827
Total lease cost	$	17,019	$	15,150

Other information about lease amounts recognized in our Consolidated Financial Statements is summarized as follows:


	Year Ended September 30,
	2021		2020
Operating cash flows used for operating leases	$	15,011	$	12,934
Operating cash flows used for finance leases	119		47
Right-of-use assets obtained in exchange for new operating lease liabilities	24,606		10,640
Right-of-use assets obtained in exchange for new finance lease liabilities	2,962		1,803


	Year Ended September 30,
	2021		2020
Weighted-average remaining lease term - operating leases	5.0 years		4.3 years
Weighted-average remaining lease term - finance leases	4.2 years		4.4 years
Weighted-average discount rate - operating leases	3.7	%	3.9	%
Weighted-average discount rate - finance leases	4.3	%	5.1	%

For a discussion of leases with certain related parties which are included above, see Note 13, “Related-Party Transactions.”

Rent expense was $14,980, $14,073 and $10,553 for the years ended September 30, 2021, 2020 and 2019, respectively.

Lessee, Operating Leases

9. LEASES

The maturities of our lease liabilities as of September 30, 2021, are as follows:


	Operating Leases		Finance Leases		Total
2022	$	3,840	$	266	$	4,106
2023	13,481		1,055		14,536
2024	9,466		1,043		10,509
2025	6,430		999		7,429
2026	4,632		715		5,347
Thereafter	9,411		181		9,592
Total undiscounted lease payments	$	47,260	$	4,259	$	51,519
Less: imputed interest	4,637		354		4,991
Present value of lease liabilities	$	42,623	$	3,905	$	46,528

The total future undiscounted cash flows related to lease agreements committed to but not yet commenced as of September 30, 2021, is $7,296.

Lease cost recognized in our Consolidated Statements of Comprehensive Income is summarized as follows:


	Year Ended September 30,
	2021		2020
Operating lease cost	$	13,405	$	12,910
Finance lease cost
Amortization of lease assets	634		203
Interest on lease liabilities	119		47
Finance lease cost	753		250
Short-term lease cost	1,575		1,163
Variable lease cost	1,286		827
Total lease cost	$	17,019	$	15,150

Other information about lease amounts recognized in our Consolidated Financial Statements is summarized as follows:


	Year Ended September 30,
	2021		2020
Operating cash flows used for operating leases	$	15,011	$	12,934
Operating cash flows used for finance leases	119		47
Right-of-use assets obtained in exchange for new operating lease liabilities	24,606		10,640
Right-of-use assets obtained in exchange for new finance lease liabilities	2,962		1,803


	Year Ended September 30,
	2021		2020
Weighted-average remaining lease term - operating leases	5.0 years		4.3 years
Weighted-average remaining lease term - finance leases	4.2 years		4.4 years
Weighted-average discount rate - operating leases	3.7	%	3.9	%
Weighted-average discount rate - finance leases	4.3	%	5.1	%

For a discussion of leases with certain related parties which are included above, see Note 13, “Related-Party Transactions.”

Rent expense was $14,980, $14,073 and $10,553 for the years ended September 30, 2021, 2020 and 2019, respectively.

Income Taxes (Notes)

12 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

10. INCOME TAXES

Federal and state income tax provisions are as follows:


	Year Ended September 30,
	2021		2020		2019
Federal:
Current	$	2	$	(39)	$	(1,330)
Deferred	11,678		9,317		5,908
State:
Current	4,505		3,657		2,312
Deferred	46		(4,195)		(227)
Total provision for income taxes	$	16,231	$	8,740	$	6,663

Actual income tax expense differs from income tax expense computed by applying the U.S. federal statutory corporate rate to income (loss) before income taxes as follows:


	Year Ended September 30,
	2021		2020		2019
Provision at the federal statutory rate	$	17,830	$	10,352	$	8,430
Increase resulting from:
Non-deductible expenses	658		1,974		1,277
State income taxes, net of federal deduction	3,876		2,662		2,009


Other	—		261		—
Decrease resulting from:
Share-based compensation	(715)		(75)		(556)
Change in valuation allowance	(118)		(3,334)		(83)
Contingent tax liabilities	(2,898)		(1,313)		(3,967)
Component 2 goodwill utilization	(2,241)		(1,787)		(144)

Other	(161)		—		(303)
Total provision for income taxes	$	16,231	$	8,740	$	6,663

Deferred income tax provisions result from temporary differences in the recognition of income and expenses for financial reporting purposes and for income tax purposes. The income tax effects of these temporary differences, representing deferred income tax assets and liabilities, result principally from the following:


	Year Ended September 30,
	2021		2020
Deferred income tax assets:
Allowance for credit losses	$	541	$	592
Accrued expenses	17,134		14,619
Net operating loss carryforward	6,445		22,623
Various reserves	1,285		1,764
Equity losses in affiliate	210		210
Share-based compensation	1,079		897
Capital loss carryforward	1		74
Lease asset	9,634		7,681
Other	2,914		2,444
Subtotal	39,243		50,904
Less valuation allowance	592		710
Total deferred income tax assets	38,651		50,194
Deferred income tax liabilities:
Property and equipment	509		517
Intangible assets	8,765		7,926
Lease liability	9,615		7,677
Other	753		271
Total deferred income tax liabilities	19,642		16,391
Net deferred income tax assets	$	19,009	$	33,803

In fiscal 2021 and 2020, the valuation allowance on our deferred tax assets decreased by $118 and $3,334, respectively, which is included in “Provision (benefit) for income taxes” in our Consolidated Comprehensive Income Statement.

As of September 30, 2021, we had available approximately $120,248 of federal net tax operating loss carry forward for federal income tax purposes, including $103,681 from net operating losses on which no tax benefit has been recognized and has not been recorded as a deferred tax asset. This carry forward, which may provide future tax benefits, will begin to expire in 2029. As of September 30, 2021, we had available approximately $61,396 state net tax operating loss carry forwards, including $5,398 from net operating losses on which no tax benefit has been recognized and has not been recorded as a deferred tax asset. The significant majority of these carry forwards, which may provide future tax benefits, will not begin to expire until 2026. We have provided valuation allowances on all net operating losses where it is determined it is more likely than not that they will expire without being utilized.

In assessing the realizability of deferred tax assets at September 30, 2021, we considered whether it was more likely than not that some portion or all of the deferred tax assets will not be realized. Our realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which these temporary differences become deductible. As a result, we have recorded a net deferred tax asset of $19,009 on our Consolidated Balance Sheets. We will continue to evaluate the appropriateness of our remaining deferred tax assets and need for valuation allowances on a quarterly basis.

As a result of a 2006 reorganization and related adjustment to the book basis in goodwill, we have tax basis in excess of book basis in amortizable goodwill of approximately $3,869. The tax basis in amortizable goodwill in excess of book basis is not reflected as a deferred tax asset. To the extent the amortization of the excess tax basis results in a cash tax benefit, the benefit will first go to reduce goodwill, then other long-term intangible assets, and then tax expense.

GAAP requires financial statement reporting of the expected future tax consequences of uncertain tax return reporting positions on the presumption that all relevant tax authorities possess full knowledge of those tax reporting positions, as well as all of the pertinent facts and circumstances, but it prohibits discounting of any of the related tax effects for the time value of money. The evaluation of a tax position is a two-step process. The first step is the recognition process to determine if it is more likely than not that a tax position will be sustained upon examination by the appropriate taxing authority, based on the technical merits of the position. The second step is a measurement process whereby a tax position that meets the more likely than not recognition threshold is calculated to determine the amount of benefit/expense to recognize in the financial statements. The tax position is measured at the largest amount of benefit/expense that is more likely than not of being realized upon ultimate settlement.

A reconciliation of the beginning and ending balances of unrecognized tax benefit is as follows:


	Year Ended September 30,
	2021		2020
Balance at beginning of period	$	24,861	$	26,294
Additions for position related to current year	59		111
Additions for positions of prior years	20		29
Reduction resulting from the lapse of the applicable statutes of limitations	3,061		1,573


Balance at end of period	$	21,879	$	24,861

As of September 30, 2021 and 2020, $21,879 and $24,861, respectively, of unrecognized tax benefits would result in a decrease in the provision for income tax expense. We anticipate that approximately $159 in liabilities for unrecognized tax benefits, including accrued interest, primarily from net operating losses on which no tax benefit has been recognized, may be reversed in the next twelve months. The reversal is predominately due to the expiration of the statutes of limitation for unrecognized tax benefits.

We had approximately $50 and $55 accrued for the payment of interest and penalties at September 30, 2021, and 2020, respectively. We recognize interest and penalties related to unrecognized tax benefits as part of the provision for income taxes.

The tax years ended September 30, 2018, and forward are subject to federal audit as are tax years prior to September 30, 2018, to the extent of unutilized net operating losses generated in those years. The tax years ended September 30, 2017, and forward are subject to state audits as are tax years prior to September 30, 2017, to the extent of unutilized net operating losses generated in those years.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

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+ Details

Operating Segments

12 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

11. OPERATING SEGMENTS

We manage and measure performance of our business in four distinct operating segments: Communications, Residential, Infrastructure Solutions and Commercial & Industrial. These segments are reflective of how the Company’s Chief Operating Decision Maker (“CODM”) reviews operating results for the purposes of allocating resources and assessing performance. The Company’s CODM is its Chief Executive Officer.

Transactions between segments, if any, are eliminated in consolidation. Our corporate office provides general and administrative services, as well as support services, to our four operating segments. Management allocates certain shared costs among segments for selling, general and administrative expenses and depreciation expense.

Segment information for the years ended September 30, 2021, 2020 and 2019 is as follows:


		Year Ended September 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	445,968	$	687,347	$	146,980	$	256,198	$	—	$	1,536,493
Cost of services		361,197		553,546		106,048		227,704		—		1,248,495
Gross profit		84,771		133,801		40,932		28,494		—		287,998
Selling, general and administrative		41,373		92,761		23,966		28,172		15,979		202,251

Contingent consideration		—		211		—		—		—		211
Loss (gain) on sale of assets		(4)		86		(10)		(92)		(27)		(47)
Income (loss) from operations		$	43,402	$	40,743	$	16,976	$	414	$	(15,952)	$	85,583
Other data:
	Depreciation and amortization expense	$	1,394	$	11,490	$	6,170	$	2,709	$	151	$	21,914
	Capital expenditures	$	963	$	2,829	$	2,067	$	1,453	$	89	$	7,401
	Total assets	$	164,699	$	329,691	$	137,628	$	87,577	$	47,027	$	766,622


		Year Ended September 30, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	395,141	$	411,790	$	128,379	$	255,546	$	—	$	1,190,856
Cost of services		317,013		318,034		93,358		234,492		—		962,897
Gross profit		78,128		93,756		35,021		21,054		—		227,959
Selling, general and administrative		37,674		63,668		20,418		32,128		17,023		170,911
Goodwill impairment expense		—		—		—		6,976		—		6,976
Contingent consideration		—		—		—		(11)		—		(11)
Loss (gain) on sale of assets		8		2		35		(45)		—		—
Income (loss) from operations		$	40,446	$	30,086	$	14,568	$	(17,994)	$	(17,023)	$	50,083
Other data:
	Depreciation and amortization expense	$	1,351	$	2,276	$	6,020	$	2,768	$	93	$	12,508
	Capital expenditures	$	830	$	1,459	$	795	$	1,362	$	299	$	4,745
	Total assets	$	154,808	$	110,998	$	124,640	$	68,318	$	101,764	$	560,528


		Year Ended September 30, 2019
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	321,246	$	313,336	$	136,790	$	305,624	$	—	$	1,076,996
Cost of services		264,746		248,562		105,863		275,722		—		894,893
Gross profit		56,500		64,774		30,927		29,902		—		182,103
Selling, general and administrative		31,850		46,864		18,664		27,815		15,382		140,575
Contingent consideration		(97)		—		(277)		—		—		(374)
Loss (gain) on sale of assets		(6)		(17)		105		(30)		—		52
Income (loss) from operations		$	24,753	$	17,927	$	12,435	$	2,117	$	(15,382)	$	41,850
Other data:
	Depreciation and amortization expense	$	1,513	$	852	$	4,528	$	2,563	$	101	$	9,557
	Capital expenditures	$	973	$	1,412	$	1,377	$	2,402	$	136	$	6,300
	Total assets	$	109,263	$	63,903	$	116,867	$	82,050	$	73,175	$	445,258

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Stockholders' Equity

12 Months Ended

Sep. 30, 2021

Equity [Abstract]

Stockholders' Equity Note Disclosure

12. STOCKHOLDERS’ EQUITY

Equity Incentive Plan

The Company’s 2006 Equity Incentive Plan, as amended and restated (the “Equity Incentive Plan”), provides for grants of stock options as well as grants of stock, including restricted stock. Approximately 3.0 million shares of common stock are authorized for issuance under the Equity Incentive Plan, of which approximately 817,452 shares were available for issuance at September 30, 2021.

We measure and record compensation expense for all share-based payment awards based on the fair value of the awards granted at the date of grant. The fair value of restricted stock awards and phantom stock unit awards is determined based on the number of shares granted and the closing price of IES’s common stock on the date of grant. For awards vesting upon achievement of a market condition, the likelihood of achieving that market condition is considered in determining the fair value of the grant, which we expense ratably over the vesting period. For awards vesting upon achievement of a performance condition, we record expense based on the grant date fair value when it becomes probable the performance condition will be achieved. Forfeitures are recorded in the period in which they occur. The resulting compensation expense is recognized on a straight-line basis over the requisite service period, which is generally the vesting period.

Stock Repurchase Program

In 2015, our Board authorized a stock repurchase program for the purchase from time to time of up to 1.5 million shares of the Company’s common stock, and on May 2, 2019, our Board authorized the repurchase from time to time of an additional 1.0 million

shares of the Company's common stock under the stock repurchase program. Share purchases are made for cash in open market transactions at prevailing market prices or in privately negotiated transactions or otherwise. The timing and amount of purchases under the program are determined based upon prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. All or part of the repurchases may be implemented under a Rule 10b5-1 trading plan, which allows repurchases under predetermined terms at times when the Company might otherwise be prevented from purchasing under insider trading laws or because of self-imposed blackout periods. The program does not require the Company to purchase any specific number of shares and may be modified, suspended or reinstated at any time at the Company’s discretion and without notice.

We repurchased 124,205 shares of our common stock during the year ended September 30, 2021, in open market transactions at an average price of $44.40 per share.

We repurchased 263,160 shares of our common stock during the year ended September 30, 2020, in open market transactions at an average price of $23.29 per share.

Treasury Stock

During the year ended September 30, 2021, we issued 140,280 shares of common stock from treasury and repurchased 32,323 shares of common stock from our employees to satisfy statutory tax withholding requirements upon the vesting of certain performance phantom stock units under the Equity Incentive Plan. We also repurchased 124,205 shares of common stock on the open market pursuant to our stock repurchase program, and 13,996 shares were forfeited by former employees and returned to treasury stock. During the year ended September 30, 2021, we issued 380 unrestricted shares of common stock from treasury to members of our Board of Directors as part of their overall compensation.

During the year ended September 30, 2020, we issued 113,408 shares of common stock from treasury and repurchased 56,806 shares of common stock from our employees to satisfy statutory tax withholding requirements upon the vesting of certain performance phantom stock units under the Equity Incentive Plan. We also repurchased 263,160 shares of common stock on the open market pursuant to our stock repurchase program, and 208,597 shares were forfeited by former employees and returned to treasury stock. During the year ended September 30, 2020, we issued 6,789 unrestricted shares of common stock from treasury to members of our Board of Directors as part of their overall compensation and 5,750 unrestricted shares to satisfy the exercise of outstanding options.

Restricted Stock

During the years ended September 30, 2021, 2020, and 2019, we recognized $145, $2,441, and $776, respectively, in compensation expense related to our restricted stock awards. During the year ended September 30, 2020, $1,100 of the compensation expense was settled with cash. At September 30, 2021, the unamortized compensation cost related to outstanding unvested restricted stock was $167. A summary of restricted stock awards for the years ended September 30, 2021, 2020, and 2019 is provided in the table below:


	Year Ended September 30,
	2021	2020	2019
Unvested at beginning of year	38,936	283,195	—
Granted	—	69,338	283,195
Vested	(8,183)	(105,000)	—
Forfeited	(13,996)	(208,597)	—
Unvested at end of year	16,757	38,936	283,195

The fair value of shares vesting during the years ended September 30, 2021, 2020, and 2019 was $308, $2,984 and zero, respectively. Fair value was calculated as the number of shares vested times the market price of shares on the date of vesting. The weighted average grant date fair value of unvested restricted stock at September 30, 2021 was $21.56.

All the restricted shares granted under the Equity Incentive Plan (vested or unvested) participate in dividends issued to common shareholders, if any.

Director Phantom Stock Units

Director phantom stock units (“Director PSUs”) are primarily granted to the members of the Board of Directors as part of their overall compensation. These Director PSUs are contractual rights to receive one share of the Company's common stock and are paid via unrestricted stock grants to each director upon their departure from the Board of Directors. We record compensation expense for the full value of the grant on the date of grant. For the years ended September 30, 2021, 2020, and 2019, we recognized $376, $390, and $300, respectively, in compensation expense related to these grants.

Employee Phantom Stock Units

An employee phantom stock unit (an “Employee PSU”) is a contractual right to receive one share of the Company’s common stock. Depending on the terms of each grant, Employee PSUs may vest upon the achievement of certain specified performance objectives and continued performance of services, or may vest based on continued performance of services through the vesting date.

As of September 30, 2020, the Company had outstanding Employee PSUs, which, subject to the achievement of certain performance metrics, could have resulted in the issuance of 204,501 shares of common stock. During the year ended September 30, 2021, 13,402 Employee PSUs were forfeited and 71,420 vested, and the Company granted additional Employee PSUs, which, subject to the achievement of certain performance metrics, could result in the issuance of 163,264 shares of common stock. As of September 30, 2021, a maximum of 282,942 shares of common stock may be issued under outstanding Employee PSUs.

During the year ended September 30, 2021, 2020, and 2019 we recognized compensation expense of $2,986, $1,443, and $1,151, respectively, related to Employee PSUs. The vesting of these awards is subject to either the achievement of specified levels of cumulative net income before taxes (a performance condition) or specified stock price levels (a market condition) and continued performance of services, or based on continued performance of services through the vesting date alone. For stock awards where vesting depends on achievement of a performance condition, we record expense when we conclude it is probable that the performance condition will be met. At September 30, 2021, it is deemed probable that the portion of the awards that vest based on performance conditions will vest.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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+ Details

Related Party Transactions (Notes)	12 Months Ended
Related Party Transactions (Notes)	Sep. 30, 2021
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	13. RELATED-PARTY TRANSACTIONS The Company is a party to a sublease agreement with Tontine Associates, for corporate office space in Greenwich, Connecticut. The lease was renewed in November 2019, with monthly rent of approximately $8. Payments by the Company are at a rate consistent with that paid by Tontine Associates to its landlord. See Note 3, “Controlling Shareholder” for additional information regarding Tontine.

Employee Benefit Plans (Notes)	12 Months Ended
Employee Benefit Plans (Notes)	Sep. 30, 2021
Retirement Benefits [Abstract]
Compensation and Employee Benefit Plans [Text Block]	14. EMPLOYEE BENEFIT PLANS 401(k) Plan In November 1998, we established the IES Holdings, Inc. 401(k) Retirement Savings Plan. All full-time IES employees are eligible to participate on the first day of the month subsequent to completing sixty days of service and attaining age twenty-one. Participants become vested in our matching contributions following three years of service. We also maintain several subsidiary retirement savings plans. We recognized $3,386, $2,326, and $2,144 in matching expenses in fiscal years 2021, 2020, and 2019, respectively. Executive Savings Plan Under the Executive Deferred Compensation Plan adopted on July 1, 2004 (the “Executive Savings Plan”), certain employees are permitted to defer a portion (up to 75%) of their base salary and/or bonus for a plan year. The Human Resources and Compensation Committee of the Board of Directors may, in its sole discretion, credit one or more participants with an employer deferral (contribution) in such amount as the Committee may choose (“Employer Contribution”). The Employer Contribution, if any, may be a fixed dollar amount, a fixed percentage of the participant’s compensation, base salary, or bonus, or a “matching” amount with respect to all or part of the participant’s elective deferrals for such plan year, and/or any combination of the foregoing as the Committee may choose. No compensation earned during the years ended September 30, 2021, 2020, or 2019 was deferred under this plan. Multiemployer Pension Plan The Infrastructure Solutions segment participates in a multiemployer direct benefit pension plan for employees covered under one of our collective bargaining agreements. We do not administer the plan. We do not significantly participate in this plan. As of December 31, 2020, this plan was funded at 84.38%.

Fair Value Measurements

12 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

15. FAIR VALUE MEASUREMENTS

Fair value is considered the price to sell an asset, or transfer a liability, between market participants on the measurement date. Fair value measurements assume that (1) the asset or liability is exchanged in an orderly manner, (2) the exchange is in the principal market for that asset or liability, and (3) the market participants are independent, knowledgeable, able and willing to transact an

exchange. Fair value accounting and reporting establishes a framework for measuring fair value by creating a hierarchy for observable independent market inputs and unobservable market assumptions and expands disclosures about fair value measurements. Judgment is required to interpret the market data used to develop fair value estimates. As such, the estimates presented herein are not necessarily indicative of the amounts that could be realized in a current exchange. The use of different market assumptions and/or estimation methods could have a material effect on the estimated fair value.

Financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2021 and 2020, are summarized in the following tables by the type of inputs applicable to the fair value measurements:


	September 30, 2021
	Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable (Level 3)
Executive savings plan assets	$	937	$	937	$	—
Executive savings plan liabilities	(806)		(806)		—
Contingent consideration liability	(4,181)		—		(4,181)
Total	$	(4,050)	$	131	$	(4,181)


	September 30, 2020
	Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable (Level 3)
Executive savings plan assets	$	766	$	766	$	—
Executive savings plan liabilities	(644)		(644)		—

Total	$	122	$	122	$	—

In fiscal year 2021, we entered into a contingent consideration arrangement related to the acquisition of Bayonet. At September 30, 2021, we estimated the fair value of this contingent consideration liability at $4,181. The table below presents the fair value of this obligation, which used significant unobservable inputs (Level 3).

In fiscal years 2016, 2017, and 2018, we entered into contingent consideration arrangements related to certain acquisitions. Please see Note 19, “Business Combinations” for further discussion. At September 30, 2021, we estimated the fair value of these contingent consideration liabilities at zero. The table below presents a reconciliation of the fair value of these obligations, which used significant unobservable inputs (Level 3).


	Contingent Consideration Agreement
Fair Value at September 30, 2019	$	11
Issuances	—
Settlements	—
Net adjustments to fair value	(11)
Fair Value at September 30, 2020	$	—
Acquisitions	(4,074)
Net adjustments to fair value	(107)
Fair Value at September 30, 2021	$	(4,181)

Below is a description of the inputs used to value the assets summarized in the preceding tables:

Level 1 — Inputs represent unadjusted quoted prices for identical assets exchanged in active markets.

Level 2 — Inputs include directly or indirectly observable inputs other than Level 1 inputs such as quoted prices for similar assets exchanged in active or inactive markets; quoted prices for identical assets exchanged in inactive markets; and other inputs that are considered in fair value determinations of the assets.

Level 3 — Inputs include unobservable inputs used in the measurement of assets. Management is required to use its own assumptions regarding unobservable inputs because there is little, if any, market activity in the assets or related observable inputs that can be corroborated at the measurement date.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Inventory

12 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventory Disclosure [Text Block]

16. INVENTORY

Inventories consist of the following components:


	September 30,
	2021		2020
Raw materials	$	5,819	$	3,232
Work in process	6,848		4,894
Finished goods	1,554		1,186
Parts and supplies	54,352		15,577
Total inventories	$	68,573	$	24,889

Goodwill and Intangible Assets

12 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

17. GOODWILL AND INTANGIBLE ASSETS

Goodwill

The following summarizes changes in the carrying value of goodwill by segment for the years ended September 30, 2021 and 2020:


	Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Balance at September 30, 2019	$	2,816	$	10,018	$	30,812	$	6,976	$	50,622
Acquisitions (Note 19)	—		6,201		3,916		—		10,117
Goodwill impairment	—		—		—		(6,976)		(6,976)
Balance at September 30, 2020	2,816		16,219		34,728		—		53,763
Acquisitions (Note 19)	—		35,151		3,481		—		38,632

Balance at September 30, 2021	$	2,816	$	51,370	$	38,209	$	—	$	92,395

Based on the results of our annual goodwill impairment assessment at September 30, 2021, we concluded the fair value of each of our reporting units exceeded its book value, and therefore we recorded no impairment charges for the year ended September 30, 2021.

In 2020, our Commercial & Industrial reporting unit experienced operating losses. Our performance was affected by the COVID-19 pandemic and other market factors which delayed the awarding of new projects, decreased demand for new construction in market sectors such as retail, office, and hospitality, and negatively impacted our revenue, profitability and backlog. As a result of this increasingly competitive and uncertain environment, and the financial performance of this reporting unit, we concluded in performing our annual goodwill impairment assessment as of September 30, 2020 that the fair value of our Commercial & Industrial reporting unit was less than its carrying amount, which resulted in the recognition of a non-cash goodwill impairment charge of $6,976 for the year ended September 30, 2020.

Intangible Assets

Intangible assets consist of the following:


				September 30, 2021
	Estimated Useful Lives (in Years)			Gross Carrying Amount		Accumulated Amortization		Net
Trademarks/trade names	5	-	20	$	15,262	$	(2,891)	$	12,371
Technical library	20			400		(161)		239
Customer relationships	6	-	15	96,879		(24,021)		72,858
Non-competition arrangements	5			40		(25)		15
Backlog and construction contracts	1			4,957		(4,821)		136
Total				$	117,538	$	(31,919)	$	85,619


				September 30, 2020
	Estimated Useful Lives (in Years)			Gross Carrying Amount		Accumulated Amortization		Net
Trademarks/trade names	5	-	20	$	7,754	$	(1,741)	$	6,013
Technical library	20			400		(141)		259
Customer relationships	6	-	15	46,449		(14,900)		31,549
Non-competition arrangements	5			40		(17)		23
Backlog and construction contracts	1			3,383		(1,870)		1,513
Total				$	58,026	$	(18,669)	$	39,357

For the years ended September 30, 2021, 2020, and 2019, amortization expense of intangible assets was $13,191, $6,424 and $3,950, respectively. Our estimated future amortization expense for years ending September 30 is as follows:


Year Ending September 30,
2022	$	13,683
2023	13,153
2024	12,810
2025	12,370
2026	12,030
Thereafter	21,573
Total	$	85,619

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	18. COMMITMENTS AND CONTINGENCIES Legal Matters From time to time we are a party to various claims, lawsuits and other legal proceedings that arise in the ordinary course of business. We maintain various insurance coverages to minimize financial risk associated with these proceedings. None of these proceedings, separately or in the aggregate, are expected to have a material adverse effect on our financial position, results of operations or cash flows. With respect to all such proceedings, we record reserves when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. We expense routine legal costs related to these proceedings as they are incurred. On June 22, 2021, the United States Department of Labor Wage and Hour Division (the “DOL”) notified IES Residential, Inc. (“IESR”), our subsidiary, that the DOL had commenced an administrative investigation of IESR’s compliance with laws regulating employee wage payment. The inquiry concerned overtime calculations and record keeping with respect to certain Arizona employees who are paid on a piece rate basis. In response to certain DOL requests, IESR produced documents and made employees available for interviews. On November 10, 2021, the DOL indicated that it believes IESR piece rate employees did not record all hours worked, and therefore IESR was not in compliance with the Fair Labor Standards Act. We dispute this claim, and plan to vigorously defend ourselves. To date, the Company has not established a reserve with respect to this matter, as we believe the likelihood of our responsibility for damages is not probable and a potential range of exposure is not reasonably estimable. Risk Management We retain the risk for workers’ compensation, employer’s liability, automobile liability, construction defects, general liability and employee group health claims, as well as pollution coverage, resulting from uninsured deductibles per accident or occurrence which are generally subject to annual aggregate limits. Our general liability program provides coverage for bodily injury and property damage. In many cases, we insure third parties, including general contractors, as additional insured parties under our insurance policies. Losses are accrued based upon our known claims incurred and an estimate of claims incurred but not reported. As a result, many of our claims are effectively self-insured. Many claims against our insurance are in the form of litigation. At September 30, 2021 and 2020, we had $5,787 and $6,254, respectively, accrued for self-insurance liabilities. We are also subject to construction defect liabilities, primarily within our Residential segment. As of September 30, 2021 and 2020, we had $8 and $36, respectively, reserved for these claims. Because the reserves are based on judgment and estimates, and involve variables that are inherently uncertain, such as the outcome of litigation and an assessment of insurance coverage, there can be no assurance that the ultimate liability will not be higher or lower than such estimates or that the timing of payments will not create liquidity issues for the Company. Some of the underwriters of our casualty insurance program require us to post letters of credit as collateral. This is common in the insurance industry. To date, we have not had a situation where an underwriter has had reasonable cause to effect payment under a letter of credit. At September 30, 2021 and 2020, $4,327 and $5,464, respectively, of our outstanding letters of credit was utilized to collateralize our insurance program. Surety As of September 30, 2021, the estimated cost to complete our bonded projects was approximately $80,285. We evaluate our bonding requirements on a regular basis, including the terms offered by our sureties. We believe the bonding capacity presently provided by our current sureties is adequate for our current operations and will be adequate for our operations for the foreseeable future. Posting letters of credit in favor of our sureties reduces the borrowing availability under our revolving credit facility. Other Commitments and Contingencies Some of our customers and vendors require us to post letters of credit, or provide intercompany guarantees, as a means of guaranteeing performance under our contracts and ensuring payment by us to subcontractors and vendors. If our customer has reasonable cause to effect payment under a letter of credit, we would be required to reimburse our creditor for the letter of credit. From time to time, we may enter into firm purchase commitments for materials, such as copper or aluminum wire, which we expect to use in the ordinary course of business. These commitments are typically for terms of less than one year and require us to buy minimum quantities of materials at specific intervals at a fixed price over the term. As of September 30, 2021, we had commitments of $12,292 outstanding under agreements to purchase copper wire and other materials over the next 12 months in the ordinary course of business.

Business Combinations and Divestitures

12 Months Ended

Sep. 30, 2020

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

19. BUSINESS COMBINATIONS

Fiscal 2021

The Company completed four acquisitions during the year ended September 30, 2021 for a total aggregate cash consideration of $92,463.

•Edmonson Electric, LLC ("Edmonson") - On May 18, 2021, we acquired an 80% ownership interest in Edmonson, a Land O'Lakes, Florida-based provider of residential electric, low voltage, and heating, ventilation and air conditioning (HVAC) installation services. The acquisition of Edmonson expanded our presence in the Florida market and added electrical to our Florida service offerings. Edmonson is part of our Residential segment and continues to operate under the Edmonson name.

•Bayonet Plumbing, Heating & Air-Conditioning, LLC ("Bayonet") - On December 21, 2020, we acquired an 80% ownership interest in Bayonet, a Hudson, Florida-based provider of residential HVAC and plumbing installation and maintenance services. The acquisition of Bayonet allowed us to expand into the Florida market, while adding plumbing and HVAC to our service offerings. Bayonet is part of our Residential segment and continues to operate under the Bayonet name.

•Wedlake Fabricating, Inc. (“Wedlake”) - On November 19, 2020, we acquired Wedlake, a Tulsa, Oklahoma-based manufacturer of custom generator enclosures that are primarily used by data centers and large commercial and industrial facilities. The acquisition of Wedlake expanded our generator enclosures business and our geographic footprint. Wedlake is part of our Infrastructure Solutions segment and continues to operate under the Wedlake name.

•K.E.P. Electric, Inc. (“KEP”) - On November 5, 2020, we acquired KEP, a Batavia, Ohio-based electrical contractor specializing in the design and installation of electrical systems for single-family housing and multi-family developments. The acquisition of KEP, which has operations in Ohio and Kentucky, advanced the expansion of our Residential service offerings into the Midwest. KEP is part of our Residential segment and continues to operate under the KEP name.

Total aggregate cash consideration for these acquisitions was $92,463, of which $10,916 was paid into escrow pending discharge of the acquired companies' indebtedness under the Paycheck Protection Program ("PPP") established by the Coronavirus Aid, Relief, and Economic Security Act and implemented by the U.S. Small Business Administration. Loans made under the PPP are eligible to be forgiven if certain criteria are met. As of September 30, 2021, all PPP loans were forgiven and escrow payments have been distributed to the respective sellers.

In addition to the cash consideration, the purchase price also includes contingent consideration with respect to the acquisition of Bayonet of up to $4,500 due in December 2023. Amounts to be paid are contingent on earnings achieved over a three year period, and will accrue interest on the $4,500 at a rate of 3%, to be paid quarterly. This contingent liability was valued at $4,074 as of the date of the acquisition.

The Company accounted for the transactions under the acquisition method of accounting, which requires recording assets and liabilities at fair value (Level 3). The valuations derived from the estimated fair value assessments and assumptions used by management are preliminary pending finalization of certain tangible and intangible asset valuations and assessment of deferred taxes. While management believes the preliminary estimates and assumptions underlying the valuations are reasonable, different estimates and assumptions could result in different values being assigned to individual assets acquired and liabilities assumed. This may result

in further adjustments to the preliminary amounts recorded. The preliminary valuation of the assets acquired and liabilities assumed is as follows:


Current assets	$	36,348
Property and equipment	11,965
Intangible assets	59,648
Goodwill	38,632
Operating right of use assets	837
Current liabilities	(29,149)
Operating long-term lease liabilities	(723)
Deferred tax liability	(3,282)
Noncontrolling interest	(21,813)
Net assets acquired	$	92,463

With regard to goodwill, the balance is attributable to the workforce of the acquired business and other intangibles that do not qualify for separate recognition. In connection with these acquisitions, the preliminary estimate of acquired goodwill is $38,632 of which $20,741 is tax deductible.

The intangible assets acquired primarily consisted of Customer Relationships and Trade Names with a total weighted-average amortization period of 6.4 years.

These acquisitions contributed $179,628 in revenue and $6,508 in operating income during the year ended September 30, 2021.

Fiscal 2020

We completed two acquisitions in fiscal 2020 for total aggregate cash consideration of $28,952. In February 2020, we acquired both Aerial Lighting & Electric, Inc. ("Aerial"), a Naugatuck, Connecticut-based electrical contractor specializing in the design and installation of electrical systems for multi-family developments, and Plant Power and Control Systems, L.L.C. ("PPCS"), a Birmingham, Alabama-based manufacturer and installer of custom engineered power distribution equipment.

These acquisitions contributed $21,836 in revenue and $812 in operating income during the year ended September 30, 2020.

Unaudited Pro Forma Information

The following unaudited supplemental pro forma results of operations for the year ended September 30, 2021 are calculated as if each acquisition occurred as of October 1 of the fiscal year prior to consummation.


		Unaudited
		Twelve Months Ended September 30,
		2021		2020
Revenues	$	1,631,057	$	1,441,933
Net income attributable to IES Holdings, Inc.	$	69,928	$	49,257

Subsequent Events	12 Months Ended
Subsequent Events	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	20. SUBSEQUENT EVENTS On December 2, 2021, we entered into the Ninth Amendment of our Prior Credit Agreement with Wells Fargo. The Ninth Amendment, among other things, increases the maximum revolver amount from $100,000 to $125,000, reduces our required minimum Liquidity from $20,000 to $12,500, and extends the maturity date from September 30, 2024 to September 30, 2026. The Ninth Amendment also addresses the banking industry's transition away from the London Interbank Offered Rate ("LIBOR") as a benchmark interest rate by replacing LIBOR with the Secured Overnight Financing Rate ("SOFR") as the benchmark for establishing the interest rate charged on our borrowings. Under the terms of the Ninth Amendment, amounts outstanding bear interest at a per annum rate equal to a Daily Three Month SOFR, plus an interest rate margin, which is determined quarterly, based on the following thresholds:

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

Asset Impairment

Use of Estimates

Cash and Cash Equivalents

We consider all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents.

Inventories

Property and Equipment

Goodwill

Intangible Assets

Intangible assets with definite lives are amortized over their estimated useful lives based on expected economic benefit with no residual value.

Debt Issuance Costs

Revenue Recognition

Accounts Receivable and Allowance for Credit Losses

Comprehensive Income (Loss)

Comprehensive income (loss) includes all changes in equity during a period except those resulting from investments by and distributions to stockholders.

Income Taxes

Risk Management


Year Ending September 30:
	2022	$	1,047
	2023		714
	2024		452
	2025		285
	2026		167
	Thereafter		601
Total		$	3,266

We had letters of credit totaling $4,327 outstanding at September 30, 2021 to collateralize certain of our high deductible insurance obligations.

Realization of Long-Lived Assets

Risk Concentration

No single customer accounted for more than 10% of our consolidated revenues or accounts receivable for the years ended September 30, 2021, 2020 and 2019.

Fair Value of Financial Instruments

Deferred Compensation Plans

Noncontrolling Interest

Leases

Accounting Standards Not Yet Adopted

Accounting Standards Recently Adopted

Activity in our allowance for credit losses consists of the following:


	Year Ended September 30,
	2021		2020
Balance at beginning of period	$	2,613	$	1,184
Additions to costs and expenses, inclusive of ASU 2016-13 adoption adjustment	1,216		1,864
Deductions for uncollectible receivables written off, net of recoveries	(1,442)		(435)
Balance at end of period	$	2,387	$	2,613

Other than trade receivables due in one year or less, we do not have any other financial assets that are past due or are on non-accrual status.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Periods of Expected Insurance Payments

Based on historical payment patterns, we expect payments of undiscounted ultimate losses to be made as follows:


Year Ending September 30:
	2022	$	1,047
	2023		714
	2024		452
	2025		285
	2026		167
	Thereafter		601
Total		$	3,266

Accounts Receivable, Allowance for Credit Loss [Table Text Block]

Activity in our allowance for credit losses consists of the following:


	Year Ended September 30,
	2021		2020
Balance at beginning of period	$	2,613	$	1,184
Additions to costs and expenses, inclusive of ASU 2016-13 adoption adjustment	1,216		1,864
Deductions for uncollectible receivables written off, net of recoveries	(1,442)		(435)
Balance at end of period	$	2,387	$	2,613

Revenue Recognition (Tables)

12 Months Ended

Sep. 30, 2021

Revenue Recognition and Deferred Revenue [Abstract]

Disaggregation of Revenue [Table Text Block]


	Year Ended September 30,
	2021		2020		2019
Communications	$	445,968	$	395,141	$	321,246
Residential
Single-family	454,449		239,140		212,358
Multi-family and Other	232,898		172,650		100,978
Total Residential	687,347		411,790		313,336
Infrastructure Solutions
Industrial Services	44,427		40,701		48,948
Custom Power Solutions	102,553		87,678		87,842
Total Infrastructure Solutions	146,980		128,379		136,790
Commercial & Industrial	256,198		255,546		305,624
Total Revenue	$	1,536,493	$	1,190,856	$	1,076,996


	Year Ended September 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	327,496	$	687,347	$	139,532	$	243,546	$	1,397,921
Time-and-material		118,472		—		7,448		12,652		138,572
Total revenue		$	445,968	$	687,347	$	146,980	$	256,198	$	1,536,493


	Year Ended September 30, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	309,567	$	411,790	$	121,922	$	241,864	$	1,085,143
Time-and-material		85,574		—		6,457		13,682		105,713
Total revenue		$	395,141	$	411,790	$	128,379	$	255,546	$	1,190,856

	Year Ended September 30, 2019
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	229,143	$	313,336	$	129,096	$	286,319	$	957,894
Time-and-material		92,103		—		7,694		19,305		119,102
Total revenue		$	321,246	$	313,336	$	136,790	$	305,624	$	1,076,996

Property and Equipment (Tables)

12 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]


	Estimated Useful Lives in Years			Year Ended September 30,
				2021		2020
Land	N/A			$	1,436	$	1,436
Buildings and improvements	5	-	20	15,445		14,378
Machinery and equipment	3	-	10	48,443		32,695
Information systems	2	-	8	8,555		8,496
Furniture and fixtures	5	-	7	1,571		1,746
				$	75,450	$	58,751
Less-Accumulated depreciation				(41,308)		(34,544)
Construction in progress				1,312		382
Property and equipment, net				$	35,454	$	24,589

Per Share Information (Tables)

12 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]


	Year Ended September 30,
	2021		2020		2019
Numerator:
Net income attributable to IES Holdings, Inc.	$	66,658	$	41,599	$	33,206
Increase in noncontrolling interest	(315)		(194)		—
Net income attributable to restricted shareholders of IES Holdings, Inc.	(56)		(575)		(256)
Net income attributable to common shareholders of IES Holdings, Inc.	$	66,287	$	40,830	$	32,950

Denominator:
Weighted average common shares outstanding — basic	20,790,307		20,795,892		21,082,012
Effect of dilutive stock options and non-vested securities	296,125		296,518		233,233
Weighted average common and common equivalent shares outstanding — diluted	21,086,432		21,092,410		21,315,245

Earnings per share attributable to common shareholders of IES Holdings, Inc.:
Basic	$	3.19	$	1.96	$	1.56
Diluted	$	3.15	$	1.94	$	1.55

Detail of Certain Balance Sheet Accounts (Tables)

12 Months Ended

Sep. 30, 2021

Detail of Certain Balance Sheet Accounts [Abstract]

Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]


	Year Ended September 30,
	2021		2020
Accounts payable, trade	$	136,967	$	93,315
Accrued compensation and benefits	61,109		53,933
Accrued insurance liabilities	5,787		6,254
Current operating lease liabilities	13,973		11,056
Other accrued expenses	31,278		22,152
	$	249,114	$	186,710

Schedule of Other Assets [Table Text Block]


	Year Ended September 30,
	2021		2020
Executive Savings Plan assets	$	937	$	766
Securities and equity investments	10		—
Right of use asset - finance leases	3,927		1,600
Other	2,175		3,414
Total	$	7,049	$	5,780

Debt (Tables)

12 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]


	Year Ended September 30,
	2021		2020
Revolving loan (long-term debt)	$	40,339	$	12
Debt issuance costs (1)	(656)		—
Other long-term debt	63		205
Total debt	$	39,746	$	217

Leases (Tables)

12 Months Ended

Sep. 30, 2021

Leases [Abstract]

Lessee, Operating Lease, Liability, Maturity

The maturities of our lease liabilities as of September 30, 2021, are as follows:


	Operating Leases		Finance Leases		Total
2022	$	3,840	$	266	$	4,106
2023	13,481		1,055		14,536
2024	9,466		1,043		10,509
2025	6,430		999		7,429
2026	4,632		715		5,347
Thereafter	9,411		181		9,592
Total undiscounted lease payments	$	47,260	$	4,259	$	51,519
Less: imputed interest	4,637		354		4,991
Present value of lease liabilities	$	42,623	$	3,905	$	46,528

Lease, Cost

Lease cost recognized in our Consolidated Statements of Comprehensive Income is summarized as follows:


	Year Ended September 30,
	2021		2020
Operating lease cost	$	13,405	$	12,910
Finance lease cost
Amortization of lease assets	634		203
Interest on lease liabilities	119		47
Finance lease cost	753		250
Short-term lease cost	1,575		1,163
Variable lease cost	1,286		827
Total lease cost	$	17,019	$	15,150

Schedule of Cash Flow, Supplemental Disclosures

Other information about lease amounts recognized in our Consolidated Financial Statements is summarized as follows:


	Year Ended September 30,
	2021		2020
Operating cash flows used for operating leases	$	15,011	$	12,934
Operating cash flows used for finance leases	119		47
Right-of-use assets obtained in exchange for new operating lease liabilities	24,606		10,640
Right-of-use assets obtained in exchange for new finance lease liabilities	2,962		1,803


	Year Ended September 30,
	2021		2020
Weighted-average remaining lease term - operating leases	5.0 years		4.3 years
Weighted-average remaining lease term - finance leases	4.2 years		4.4 years
Weighted-average discount rate - operating leases	3.7	%	3.9	%
Weighted-average discount rate - finance leases	4.3	%	5.1	%

Income Taxes (Tables)

12 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]


	Year Ended September 30,
	2021		2020		2019
Federal:
Current	$	2	$	(39)	$	(1,330)
Deferred	11,678		9,317		5,908
State:
Current	4,505		3,657		2,312
Deferred	46		(4,195)		(227)
Total provision for income taxes	$	16,231	$	8,740	$	6,663

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]


	Year Ended September 30,
	2021		2020		2019
Provision at the federal statutory rate	$	17,830	$	10,352	$	8,430
Increase resulting from:
Non-deductible expenses	658		1,974		1,277
State income taxes, net of federal deduction	3,876		2,662		2,009


Other	—		261		—
Decrease resulting from:
Share-based compensation	(715)		(75)		(556)
Change in valuation allowance	(118)		(3,334)		(83)
Contingent tax liabilities	(2,898)		(1,313)		(3,967)
Component 2 goodwill utilization	(2,241)		(1,787)		(144)

Other	(161)		—		(303)
Total provision for income taxes	$	16,231	$	8,740	$	6,663

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]


	Year Ended September 30,
	2021		2020
Deferred income tax assets:
Allowance for credit losses	$	541	$	592
Accrued expenses	17,134		14,619
Net operating loss carryforward	6,445		22,623
Various reserves	1,285		1,764
Equity losses in affiliate	210		210
Share-based compensation	1,079		897
Capital loss carryforward	1		74
Lease asset	9,634		7,681
Other	2,914		2,444
Subtotal	39,243		50,904
Less valuation allowance	592		710
Total deferred income tax assets	38,651		50,194
Deferred income tax liabilities:
Property and equipment	509		517
Intangible assets	8,765		7,926
Lease liability	9,615		7,677
Other	753		271
Total deferred income tax liabilities	19,642		16,391
Net deferred income tax assets	$	19,009	$	33,803

Summary of Income Tax Contingencies [Table Text Block]


	Year Ended September 30,
	2021		2020
Balance at beginning of period	$	24,861	$	26,294
Additions for position related to current year	59		111
Additions for positions of prior years	20		29
Reduction resulting from the lapse of the applicable statutes of limitations	3,061		1,573


Balance at end of period	$	21,879	$	24,861

Operating Segments (Tables)

12 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]


		Year Ended September 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	445,968	$	687,347	$	146,980	$	256,198	$	—	$	1,536,493
Cost of services		361,197		553,546		106,048		227,704		—		1,248,495
Gross profit		84,771		133,801		40,932		28,494		—		287,998
Selling, general and administrative		41,373		92,761		23,966		28,172		15,979		202,251

Contingent consideration		—		211		—		—		—		211
Loss (gain) on sale of assets		(4)		86		(10)		(92)		(27)		(47)
Income (loss) from operations		$	43,402	$	40,743	$	16,976	$	414	$	(15,952)	$	85,583
Other data:
	Depreciation and amortization expense	$	1,394	$	11,490	$	6,170	$	2,709	$	151	$	21,914
	Capital expenditures	$	963	$	2,829	$	2,067	$	1,453	$	89	$	7,401
	Total assets	$	164,699	$	329,691	$	137,628	$	87,577	$	47,027	$	766,622


		Year Ended September 30, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	395,141	$	411,790	$	128,379	$	255,546	$	—	$	1,190,856
Cost of services		317,013		318,034		93,358		234,492		—		962,897
Gross profit		78,128		93,756		35,021		21,054		—		227,959
Selling, general and administrative		37,674		63,668		20,418		32,128		17,023		170,911
Goodwill impairment expense		—		—		—		6,976		—		6,976
Contingent consideration		—		—		—		(11)		—		(11)
Loss (gain) on sale of assets		8		2		35		(45)		—		—
Income (loss) from operations		$	40,446	$	30,086	$	14,568	$	(17,994)	$	(17,023)	$	50,083
Other data:
	Depreciation and amortization expense	$	1,351	$	2,276	$	6,020	$	2,768	$	93	$	12,508
	Capital expenditures	$	830	$	1,459	$	795	$	1,362	$	299	$	4,745
	Total assets	$	154,808	$	110,998	$	124,640	$	68,318	$	101,764	$	560,528


		Year Ended September 30, 2019
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	321,246	$	313,336	$	136,790	$	305,624	$	—	$	1,076,996
Cost of services		264,746		248,562		105,863		275,722		—		894,893
Gross profit		56,500		64,774		30,927		29,902		—		182,103
Selling, general and administrative		31,850		46,864		18,664		27,815		15,382		140,575
Contingent consideration		(97)		—		(277)		—		—		(374)
Loss (gain) on sale of assets		(6)		(17)		105		(30)		—		52
Income (loss) from operations		$	24,753	$	17,927	$	12,435	$	2,117	$	(15,382)	$	41,850
Other data:
	Depreciation and amortization expense	$	1,513	$	852	$	4,528	$	2,563	$	101	$	9,557
	Capital expenditures	$	973	$	1,412	$	1,377	$	2,402	$	136	$	6,300
	Total assets	$	109,263	$	63,903	$	116,867	$	82,050	$	73,175	$	445,258

Stockholders' Equity (Tables)

12 Months Ended

Sep. 30, 2021

Equity [Abstract]

Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]


	Year Ended September 30,
	2021	2020	2019
Unvested at beginning of year	38,936	283,195	—
Granted	—	69,338	283,195
Vested	(8,183)	(105,000)	—
Forfeited	(13,996)	(208,597)	—
Unvested at end of year	16,757	38,936	283,195

Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]


	September 30, 2021
	Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable (Level 3)
Executive savings plan assets	$	937	$	937	$	—
Executive savings plan liabilities	(806)		(806)		—
Contingent consideration liability	(4,181)		—		(4,181)
Total	$	(4,050)	$	131	$	(4,181)


	September 30, 2020
	Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable (Level 3)
Executive savings plan assets	$	766	$	766	$	—
Executive savings plan liabilities	(644)		(644)		—

Total	$	122	$	122	$	—

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]


	Contingent Consideration Agreement
Fair Value at September 30, 2019	$	11
Issuances	—
Settlements	—
Net adjustments to fair value	(11)
Fair Value at September 30, 2020	$	—
Acquisitions	(4,074)
Net adjustments to fair value	(107)
Fair Value at September 30, 2021	$	(4,181)

Inventory (Tables)

12 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]


	September 30,
	2021		2020
Raw materials	$	5,819	$	3,232
Work in process	6,848		4,894
Finished goods	1,554		1,186
Parts and supplies	54,352		15,577
Total inventories	$	68,573	$	24,889

Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]


	Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Balance at September 30, 2019	$	2,816	$	10,018	$	30,812	$	6,976	$	50,622
Acquisitions (Note 19)	—		6,201		3,916		—		10,117
Goodwill impairment	—		—		—		(6,976)		(6,976)
Balance at September 30, 2020	2,816		16,219		34,728		—		53,763
Acquisitions (Note 19)	—		35,151		3,481		—		38,632

Balance at September 30, 2021	$	2,816	$	51,370	$	38,209	$	—	$	92,395

Schedule of Finite-Lived Intangible Assets [Table Text Block]


				September 30, 2020
	Estimated Useful Lives (in Years)			Gross Carrying Amount		Accumulated Amortization		Net
Trademarks/trade names	5	-	20	$	7,754	$	(1,741)	$	6,013
Technical library	20			400		(141)		259
Customer relationships	6	-	15	46,449		(14,900)		31,549
Non-competition arrangements	5			40		(17)		23
Backlog and construction contracts	1			3,383		(1,870)		1,513
Total				$	58,026	$	(18,669)	$	39,357

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]


Year Ending September 30,
2022	$	13,683
2023	13,153
2024	12,810
2025	12,370
2026	12,030
Thereafter	21,573
Total	$	85,619

Business Combinations and Divestitures (Tables)

12 Months Ended

Sep. 30, 2021

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]


Current assets	$	36,348
Property and equipment	11,965
Intangible assets	59,648
Goodwill	38,632
Operating right of use assets	837
Current liabilities	(29,149)
Operating long-term lease liabilities	(723)
Deferred tax liability	(3,282)
Noncontrolling interest	(21,813)
Net assets acquired	$	92,463

Business Acquisition, Pro Forma Information


		Unaudited
		Twelve Months Ended September 30,
		2021		2020
Revenues	$	1,631,057	$	1,441,933
Net income attributable to IES Holdings, Inc.	$	69,928	$	49,257

Summary of Significant Accounting Policies (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Oct. 01, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Goodwill impairment expense	$ 0			$ 6,976,000	$ 0
Deferred financing cost amortization			$ 198,000	152,000	318,000
Debt Issuance Costs, Noncurrent, Net	(656,000)		(656,000)	(736,000)
Accounts Receivable, Allowance for Credit Loss	(2,387,000)		(2,387,000)	(2,613,000)
Deferred tax assets	$ 19,009,000		19,009,000	33,803,000
Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability			3,266,000	$ 3,886,000
Accrual for Loss Contingencies, Undiscounted, First Year			1,047,000
Accrual for Loss Contingencies, Undiscounted, Second Year			714,000
Accrual for Loss Contingencies, Undiscounted, Third Year			452,000
Accrual for Loss Contingencies, Undiscounted, Fourth Year			285,000
Accrual for Loss Contingencies, Undiscounted, Fifth Year			167,000
Accrual for Insurance Loss Contingencies, Undiscounted, after Fifth Year			$ 601,000
Loss Contingency Accrual, Insurance-related Assessment, Discount Rate	1.00%		1.00%	0.30%
Accrued Insurance, Current	$ 3,234,000		$ 3,234,000	$ 3,832,000
Liability for Claims and Claims Adjustment Expense, Disability, Accident and Health	2,553,000		2,553,000	2,422,000
Letters of Credit Outstanding, Amount	4,527,000		4,527,000
Redeemable Noncontrolling Interest, Equity, Redemption Value	18,262,000		18,262,000
Noncontrolling Interest, Change in Redemption Value			(315,000)		(80,000)
Operating right of use assets	42,916,000		42,916,000	31,786,000		$ 32,434,000
Operating Lease, Liability	42,623,000		42,623,000			$ 32,237,000
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts Receivable, Allowance for Credit Loss	2,387,000		2,387,000	2,613,000
Payments for Repurchase of Redeemable Noncontrolling Interest		$ 1,188,000	1,188,000
Increase (Decrease) in Deferred Income Taxes			70,000
Stockholders' Equity Attributable to Parent	345,953,000		345,953,000	283,313,000	246,248,000		$ 220,407,000
Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts Receivable, Allowance for Credit Loss, Current	284,000		284,000
Accounts Receivable, Allowance for Credit Loss, Current	284,000		284,000
Trade Accounts Receivable
Accounting Policies [Abstract]
Accounts Receivable, Allowance for Credit Loss	(2,387,000)		(2,387,000)	(2,613,000)	(1,184,000)
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounts Receivable, Allowance for Credit Loss	$ 2,387,000		2,387,000	2,613,000	$ 1,184,000
Addition to costs and expenses			1,216,000	1,864,000
Deductions for uncollectible receivables written off, net of recoveries			$ (1,442,000)	$ (435,000)

Controlling Shareholder (Details) $ in Thousands	12 Months Ended
Controlling Shareholder (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Risks and Uncertainties [Abstract]
ControllingShareholderOwnershipPercentage	56.00%
Related Party Transaction, Purchases from Related Party	$ 8

Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
Revenue Recognition (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 1,536,493	$ 1,190,856	$ 1,076,996
Unbilled Receivables, Current	20,445
Contract with Customer, Liability, Revenue Recognized	47,906	34,035
Revenue, Remaining Performance Obligation, Amount	713,274
Performance Obligation Next 12 Months	650,500
Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	445,968	395,141	321,246
Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	687,347	411,790	313,336
Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	146,980	128,379	136,790
Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	256,198	255,546	305,624
Fixed-price Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,397,921	1,085,143	957,894
Fixed-price Contract [Member] \| Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	327,496	309,567	229,143
Fixed-price Contract [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	687,347	411,790	313,336
Fixed-price Contract [Member] \| Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	139,532	121,922	129,096
Fixed-price Contract [Member] \| Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	243,546	241,864	286,319
Time-and-materials Contract [Member]
Disaggregation of Revenue [Line Items]
Revenues	138,572	105,713	119,102
Time-and-materials Contract [Member] \| Communications [Member]
Disaggregation of Revenue [Line Items]
Revenues	118,472	85,574	92,103
Time-and-materials Contract [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	0	0	0
Time-and-materials Contract [Member] \| Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,448	6,457	7,694
Time-and-materials Contract [Member] \| Commercial and Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenues	12,652	13,682	19,305
industrial Services [Member] \| Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	44,427	40,701	48,948
Custom Power Solutions [Member] \| Infrastructure Solutions [Member]
Disaggregation of Revenue [Line Items]
Revenues	102,553	87,678	87,842
Single Family Contracts [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	454,449	239,140	212,358
Multi Family and Other [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 232,898	$ 172,650	$ 100,978

Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Land	$ 1,436	$ 1,436
Buildings and Improvements, Gross	15,445	14,378
Machinery and Equipment, Gross	48,443	32,695
Capitalized Computer Software, Gross	8,555	8,496
Furniture and Fixtures, Gross	1,571	1,746
Property, Plant and Equipment, Gross	75,450	58,751
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(41,308)	(34,544)
Construction in Progress, Gross	1,312	382
Property and equipment, net	35,454	24,589
Depreciation	$ 8,090	$ 6,084	$ 5,607
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years	5 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years	20 years
Machinery and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years	3 years
Machinery and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years	10 years
Software and Software Development Costs [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years	2 years
Software and Software Development Costs [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	8 years	8 years
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years	5 years
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years	7 years

Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 66,287	$ 40,830	$ 32,950
Noncontrolling Interest, Period Increase (Decrease)	(315)	(194)	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(56)	(575)	(256)
Comprehensive income (loss) attributable to IES Holdings, Inc.	$ 66,658	$ 41,599	$ 33,206
Weighted Average Number of Shares Outstanding, Basic	20,790,307	20,795,892	21,082,012
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	296,125	296,518	233,233
Weighted Average Number of Shares Outstanding, Diluted	21,086,432	21,092,410	21,315,245
Earnings (loss) per share, basic	$ 3.19	$ 1.96	$ 1.56
Earnings (loss) per share, diluted	$ 3.15	$ 1.94	$ 1.55

Detail of Certain Balance Sheet Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Detail of Certain Balance Sheet Accounts [Abstract]
Accounts Receivable, Allowance for Credit Loss, Beginning	$ 2,613
Accounts Receivable, Allowance for Credit Loss, Ending	2,387	$ 2,613
Accounts payable, trade	136,967	93,315
Accrued compensation and benefits	61,109	53,933
Accrued insurance liabilities	5,787	6,254
Current operating lease liabilities	13,973	11,056
Other accrued expenses	31,278	22,152
Accounts payable and accrued expenses	249,114	186,710
Executive Savings Plan assets	937	766
Securities and equity investments	10	0
Finance Lease, Right-of-Use Asset, after Accumulated Amortization	3,927	1,600
Other	2,175	3,414
Other non-current assets	$ 7,049	$ 5,780

Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Revolving loan	$ 40,339	$ 12
Other long-term debt	63	205
Long-term debt	39,746	217
Debt Issuance Costs, Noncurrent, Net	656	736
Letters of Credit Outstanding, Amount	4,527
Line of Credit Facility, Remaining Borrowing Capacity	$ 55,134
Line of Credit Facility, Interest Rate at Period End	1.38%
Interest expense	$ 962	$ 777	$ 1,857
Line of Credit Facility, Maximum Borrowing Capacity	100,000
Liquidity	$ 78,239
Fixed Charge Coverage Ratio	12.0
Debt Instrument, Covenant Compliance	20,000

Leases (Details) - USD ($) $ in Thousands	12 Months Ended
Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Oct. 01, 2019
Leases [Abstract]
Current operating lease liabilities	$ 13,973	$ 11,056
Current finance lease liabilities	1,033
Lessee, Operating Lease, Liability, Payments, Due Year One	3,840
Lessee, Operating Lease, Liability, Payments, Due Year Two	13,481
Lessee, Operating Lease, Liability, Payments, Due Year Three	9,466
Lessee, Operating Lease, Liability, Payments, Due Year Four	6,430
Lessee, Operating Lease, Liability, Payments, Due Year Five	4,632
Lessee, Operating Lease, Liability, Payments, Due after Year Five	9,411
Lessee, Operating Lease, Liability, Payments, Due	47,260
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	4,637
Operating Lease, Liability	42,623			$ 32,237
Finance Lease, Liability, Payments, Due Year One	266
Finance Lease, Liability, Payments, Due Year Two	1,055
Finance Lease, Liability, Payments, Due Year Three	1,043
Finance Lease, Liability, Payments, Due Year Four	999
Finance Lease, Liability, Payments, Due Year Five	715
Finance Lease, Liability, Payments, Due after Year Five	181
Finance Lease, Liability, Payment, Due	4,259
Finance Lease, Liability, Undiscounted Excess Amount	354
Finance Lease, Liability	3,905
Lessee, Total Lease, Liability, Payments, Due Year One	4,106
Total Lease, Liability, Payments, Year Two	14,536
Total Lease, Liability, Payments, Year Three	10,509
Total Lease, Liability, Payments, Year Four	7,429
Total Lease, Liability, Payments, Year Five	5,347
Total Lease, Liability, Payments, Due After Year Five	9,592
Total Lease, Liability, Payments Due	51,519
Total Lease, Liability, Undiscounted Excess Amount	4,991
Total Lease, Liability	46,528
Minimum payments for leases not yet commenced	7,296
Operating Lease, Cost	13,405	12,910
Finance Lease, Right-of-Use Asset, Amortization	634	203
Finance Lease, Interest Expense	119	47
Finance Lease, Cost	753	250
Short-term Lease, Cost	1,575	1,163
Variable Lease, Cost	1,286	827
Lease, Cost	17,019	15,150
Operating Lease, Payments	15,011	12,934
Finance Lease, Interest Payment on Liability	119	47
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	24,606	10,640
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 2,962	$ 1,803
Operating Lease, Weighted Average Remaining Lease Term	5 years	4 years 3 months 18 days
Finance Lease, Weighted Average Remaining Lease Term	4 years 2 months 12 days	4 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate, Percent	3.70%	3.90%
Finance Lease, Weighted Average Discount Rate, Percent	4.30%	5.10%
Operating Leases, Rent Expense			$ 10,553
Payments for Rent	$ 14,980	$ 14,073
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable and accrued expenses	Accounts payable and accrued expenses
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable and accrued expenses	Accounts payable and accrued expenses
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other non-current liabilities	Other non-current liabilities
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other non-current assets	Other non-current assets

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Examination [Line Items]
Current Federal Tax Expense (Benefit)	$ 2	$ (39)	$ (1,330)
Deferred Federal Income Tax Expense (Benefit)	11,678	9,317	5,908
Current State and Local Tax Expense (Benefit)	4,505	3,657	2,312
Deferred State and Local Income Tax Expense (Benefit)	46	(4,195)	(227)
Provision for income taxes	16,231	8,740	6,663
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	17,830	10,352	8,430
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	658	1,974	1,277
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	3,876	2,662	2,009
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(118)	(3,334)	(83)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	0	261	0
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	(715)	(75)	(556)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount	(2,898)	(1,313)	(3,967)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount	(2,241)	(1,787)	(144)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(161)	0	(303)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	541	592
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities	17,134	14,619
Deferred Tax Assets, Operating Loss Carryforwards	6,445	22,623
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,285	1,764
Deferred Tax Assets, Investments	210	210
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	1,079	897
Deferred Tax Assets, Capital Loss Carryforwards	1	74
Deferred Tax Assets, Leases	9,634	7,681
Deferred Tax Assets, Other	2,914	2,444
Deferred Tax Assets, Gross	39,243	50,904
Deferred Tax Assets, Valuation Allowance	592	710
Deferred Tax Assets, Net of Valuation Allowance	38,651	50,194
Deferred Tax Liabilities, Property, Plant and Equipment	509	517
Deferred Tax Liabilities, Goodwill and Intangible Assets	8,765	7,926
Deferred Tax Liabilities, Leasing Arrangements	9,615	7,677
Deferred Tax Liabilities, Other	753	271
Deferred Tax Liabilities, Gross	19,642	16,391
Deferred tax assets	19,009	33,803
Operating Loss Carryforwards	120,248
Operating Loss Carryforwards Attributable To Goodwill Amortization	103,681
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	61,396
Reorganization Of Goodwill Excess Tax Basis	3,869
Unrecognized Tax Benefits	24,861	26,294
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	59	111
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	20	29
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	3,061	1,573
Unrecognized Tax Benefits	21,879	24,861	$ 26,294
Increase in Unrecognized Tax Benefits is Reasonably Possible	159
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	50	$ 55
State and Local Jurisdiction [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards Attributable To Goodwill Amortization	$ 5,398

Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Operating Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues		$ 1,536,493	$ 1,190,856	$ 1,076,996
Cost of services		1,248,495	962,897	894,893
Gross profit		287,998	227,959	182,103
Selling, general and administrative expenses		202,251	170,911	140,575
Goodwill impairment expense	$ 0		6,976	0
Contingent consideration		(211)	(11)	(374)
Loss (gain) on sale of assets		47	0	52
Operating income (loss)		85,583	50,083	41,850
Depreciation and amortization		21,914	12,508	9,557
Capital expenditures		7,401	4,745	6,300
Total assets	766,622	766,622	560,528	445,258
Communications [Member]
Segment Reporting Information [Line Items]
Revenues		445,968	395,141	321,246
Cost of services		361,197	317,013	264,746
Gross profit		84,771	78,128	56,500
Selling, general and administrative expenses		41,373	37,674	31,850
Goodwill impairment expense			0
Contingent consideration		0	0	97
Loss (gain) on sale of assets		4	(8)	6
Operating income (loss)		43,402	40,446	24,753
Depreciation and amortization		1,394	1,351	1,513
Capital expenditures		963	830	973
Total assets	164,699	164,699	154,808	109,263
Residential [Member]
Segment Reporting Information [Line Items]
Revenues		687,347	411,790	313,336
Cost of services		553,546	318,034	248,562
Gross profit		133,801	93,756	64,774
Selling, general and administrative expenses		92,761	63,668	46,864
Goodwill impairment expense			0
Contingent consideration		(211)	0	0
Loss (gain) on sale of assets		(86)	(2)	17
Operating income (loss)		40,743	30,086	17,927
Depreciation and amortization		11,490	2,276	852
Capital expenditures		2,829	1,459	1,412
Total assets	329,691	329,691	110,998	63,903
Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Revenues		146,980	128,379	136,790
Cost of services		106,048	93,358	105,863
Gross profit		40,932	35,021	30,927
Selling, general and administrative expenses		23,966	20,418	18,664
Goodwill impairment expense			0
Contingent consideration		0	0	277
Loss (gain) on sale of assets		10	(35)	(105)
Operating income (loss)		16,976	14,568	12,435
Depreciation and amortization		6,170	6,020	4,528
Capital expenditures		2,067	795	1,377
Total assets	137,628	137,628	124,640	116,867
Commercial and Industrial [Member]
Segment Reporting Information [Line Items]
Revenues		256,198	255,546	305,624
Cost of services		227,704	234,492	275,722
Gross profit		28,494	21,054	29,902
Selling, general and administrative expenses		28,172	32,128	27,815
Goodwill impairment expense		0	6,976
Contingent consideration		0	11	0
Loss (gain) on sale of assets		92	45	30
Operating income (loss)		414	(17,994)	2,117
Depreciation and amortization		2,709	2,768	2,563
Capital expenditures		1,453	1,362	2,402
Total assets	87,577	87,577	68,318	82,050
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Revenues		0	0	0
Cost of services		0	0	0
Gross profit		0	0	0
Selling, general and administrative expenses		15,979	17,023	15,382
Goodwill impairment expense			0
Contingent consideration		0	0	0
Loss (gain) on sale of assets		27	0	0
Operating income (loss)		(15,952)	(17,023)	(15,382)
Depreciation and amortization		151	93	101
Capital expenditures		89	299	136
Total assets	$ 47,027	$ 47,027	$ 101,764	$ 73,175

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	May 20, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Capital Shares Reserved for Future Issuance	817,452
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,500,000			1,000,000.0
Treasury Stock, Shares, Acquired	124,205	263,160
Treasury Stock Acquired, Average Cost Per Share	$ 44.40	$ 23.29
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	32,323	56,806
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(13,996)	(208,597)	0
Shares, Issued		5,750
Share-based Payment Arrangement, Cash Used to Settle Award	$ 1,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 167
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	38,936	283,195	0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	0	69,338	283,195
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(8,183)	(105,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	16,757	38,936	283,195
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 21.56
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 145	$ 2,441	$ 776
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	308	2,984	0
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 376	390	300
Performance Based Phantom Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(13,402)
Shares, Issued	163,264
Share-based Payment Arrangement, Expense	$ 2,986	$ 1,443	$ 1,151
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	71,420
Shares, Outstanding	282,942	204,501
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	170,524	528,563	564,822
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	140,280	113,408
Shares, Issued	1,316,998	1,287,134	884,518		843,993
Options exercised, shares	0	5,750	22,500
Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued	380	6,789
Share Repurchase Program [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired		263,160
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	3,000,000.0

Related Party Transactions (Details) $ in Thousands	12 Months Ended
Related Party Transactions (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Related Party Transactions [Abstract]
Related Party Transaction, Purchases from Related Party	$ 8

Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020
Retirement Benefits [Abstract]
Defined Contribution Plan, Cost	$ 3,386	$ 2,326	$ 2,144
Defined Benefit Plan, Funded Percentage				84.38%

Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Executive Savings Plan assets	$ 937	$ 766
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(806)	(644)
Business Combination, Contingent Consideration, Liability, Noncurrent	(4,181)
Fair Value, Net Asset (Liability)	(4,050)	(122)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value	0	11
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	4,074
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(107)	(11)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Executive Savings Plan assets	937	766
Financial and Nonfinancial Liabilities, Fair Value Disclosure	(806)	(644)
Fair Value, Net Asset (Liability)	(131)	(122)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Liability, Noncurrent	(4,181)
Fair Value, Net Asset (Liability)	$ (4,181)	$ 0

Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Inventory Disclosure [Abstract]
Inventory, Raw Materials, Gross	$ 5,819	$ 3,232
Inventory, Work in Process, Gross	6,848	4,894
Inventory, Finished Goods, Gross	1,554	1,186
Other Inventory, Gross	54,352	15,577
Inventory, Net	$ 68,573	$ 24,889

Goodwill and Intangible Assets Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Line Items]
Goodwill, beginning		$ 53,763	$ 50,622
Goodwill, Acquired During Period		38,632	10,117
Goodwill, Purchase Accounting Adjustments			(6,976)
Impairment expense	$ 0		(6,976)	$ 0
Goodwill, ending	92,395	92,395	53,763	50,622
Communications [Member]
Goodwill [Line Items]
Goodwill, beginning		2,816	2,816
Impairment expense			0
Goodwill, ending	2,816	2,816	2,816	2,816
Residential [Member]
Goodwill [Line Items]
Goodwill, beginning		16,219	10,018
Goodwill, Acquired During Period		35,151	6,201
Goodwill, Purchase Accounting Adjustments			0
Impairment expense			0
Goodwill, ending	51,370	51,370	16,219	10,018
Infrastructure Solutions [Member]
Goodwill [Line Items]
Goodwill, beginning		34,728	30,812
Goodwill, Acquired During Period		3,481	3,916
Impairment expense			0
Goodwill, ending	38,209	38,209	34,728	30,812
Commercial and Industrial [Member]
Goodwill [Line Items]
Goodwill, beginning		0	6,976
Goodwill, Purchase Accounting Adjustments			(6,976)
Impairment expense		0	(6,976)
Goodwill, ending	$ 0	$ 0	$ 0	$ 6,976

Goodwill and Intangible Assets Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 117,538	$ 58,026
Finite-Lived Intangible Assets, Accumulated Amortization	(31,919)	(18,669)
Intangible Assets, Net (Excluding Goodwill)	85,619	39,357
Amortization of Intangible Assets	13,191	6,424	$ 3,950
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	13,683
Finite-Lived Intangible Assets, Amortization Expense, Year Two	13,153
Finite-Lived Intangible Assets, Amortization Expense, Year Three	12,810
Finite-Lived Intangible Assets, Amortization Expense, Year Four	12,370
Finite-Lived Intangible Assets, Amortization Expense, Year Five	12,030
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	21,573
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	15,262	7,754
Finite-Lived Intangible Assets, Accumulated Amortization	(2,891)	(1,741)
Intangible Assets, Net (Excluding Goodwill)	$ 12,371	$ 6,013
Trademarks and Trade Names [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Trademarks and Trade Names [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Technical Library
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 400	$ 400
Finite-Lived Intangible Assets, Accumulated Amortization	(161)	(141)
Intangible Assets, Net (Excluding Goodwill)	$ 239	$ 259
Technical Library \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years	20 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 96,879	$ 46,449
Finite-Lived Intangible Assets, Accumulated Amortization	(24,021)	(14,900)
Intangible Assets, Net (Excluding Goodwill)	$ 72,858	$ 31,549
Customer Relationships [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years	6 years
Customer Relationships [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years	15 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 40	$ 40
Finite-Lived Intangible Assets, Accumulated Amortization	(25)	(17)
Intangible Assets, Net (Excluding Goodwill)	$ 15	$ 23
Noncompete Agreements [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years	5 years
Construction Contracts [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 4,957	$ 3,383
Finite-Lived Intangible Assets, Accumulated Amortization	(4,821)	(1,870)
Intangible Assets, Net (Excluding Goodwill)	$ 136	$ 1,513
Construction Contracts [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year	1 year

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Loss Contingency, Discounted Amount of Insurance-related Assessment Liability	$ 5,787	$ 6,254
Liability for Claims and Claims Adjustment Expense	8	36
Letters of Credit Outstanding, Amount	4,527
Estimated cost of completion of bonded projects	80,285
Purchase Commitment, Remaining Minimum Amount Committed	12,292
Insurance Related [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	$ 4,327	$ 5,464

Business Combinations and Divestitures (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Business Combinations [Abstract]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	$ 92,463
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets	36,348
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	11,965
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	837
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	59,648
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	38,632
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities	(29,149)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities	(723)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities, Current	(3,282)
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 20,741
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 4 months 24 days
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual	$ 179,628	$ 21,836
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual	6,508	812
Business Acquisition, Pro Forma Revenue	1,631,057	1,441,933
Business Acquisition, Pro Forma Net Income (Loss)	69,928	49,257
Escrow Deposit	10,916
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	4,500
Noncontrolling Interest, Increase from Business Combination	(21,813)
Cash received (paid) in conjunction with business combinations	$ 92,463	$ 28,952	$ 50

Subsequent Events (Details) - USD ($) $ in Thousands		12 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Dec. 01, 2021	Sep. 30, 2021
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100,000
Debt Instrument, Covenant Compliance		20,000
Subsequent Event
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 125,000
Debt Instrument, Covenant Compliance	12,500