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Document And Entity Information - shares	6 Months Ended
Document And Entity Information - shares	Mar. 31, 2018	May 02, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	IES Holdings, Inc.
Entity Central Index Key	0001048268
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,209,916
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
TradingSymbol	IESC

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 35,713	$ 28,290
Accounts receivable:
Trade, net of allowance of $608 and $650, respectively	127,905	142,946
Retainage	20,567	21,360
Inventories	17,590	16,923
Costs and estimated earnings in excess of billings	15,358	13,438
Prepaid expenses and other current assets	9,492	8,795
Total current assets	226,625	231,752
Property and equipment, net	25,055	24,643
Goodwill	46,738	46,693
Intangible assets, net	29,515	31,413
Deferred tax assets	50,948	86,211
Other non-current assets	6,106	3,782
Total assets	384,987	424,494
CURRENT LIABILITIES:
Accounts payable and accrued expenses	111,608	120,710
Billings in excess of costs and estimated earnings	27,820	29,918
Total current liabilities	139,428	150,628
Long-Term debt	29,570	29,434
Other non-current liabilities	4,639	4,457
Total liabilities	173,637	184,519
Noncontrolling interest	3,280	3,271
STOCKHOLDERS' EQUITY:
Preferred stock, $0.01 par value, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.01 par value, 100,000,000 shares authorized; 22,049,529 shares issued and 21,259,178 and 21,336,975 outstanding, respectively	220	220
Treasury stock, at cost, 790,351 and 712,554 shares, respectively	(8,108)	(6,898)
Additional paid-in capital	196,835	196,955
Retained earnings	19,123	46,427
Total stockholders' equity	208,070	236,704
Total liabilities and stockholders' equity	$ 384,987	$ 424,494

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Consolidated Balance Sheets [Abstract]
Trade, allowance	$ 608	$ 650
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 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	21,259,178	21,336,975
Treasury stock, shares	790,351	712,554

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Revenues	$ 205,677	$ 203,662	$ 403,977	$ 395,840
Cost of services	171,837	171,848	337,073	328,844
Gross profit	33,840	31,814	66,904	66,996
Selling, general and administrative expenses	29,647	30,120	59,736	58,314
Contingent consideration expense	71	83	71	83
Loss (gain) on sale of assets	(20)	(6)	(34)	(13)
Income from operations	4,142	1,617	7,131	8,612
Interest and other (income) expense:
Interest expense	473	428	914	874
Other (income) expense, net	(43)	(44)	(141)	(48)
Income from operations before income taxes	3,712	1,233	6,358	7,786
Provision (benefit) for income taxes	1,425	682	33,584	3,311
Net Income (loss)	2,287	551	(27,226)	4,475
Net income attributable to noncontrolling interest	66	15	122	67
Comprehensive income (loss) attributable to IES Holdings, Inc.	$ 2,221	$ 536	$ (27,348)	$ 4,408
Earnings (loss) per share attributable to IES Holdings, Inc.:
Earnings (loss) Per Share, Basic	$ 0.11	$ 0.02	$ (1.29)	$ 0.21
Earnings (loss) Per Share, Diluted	$ 0.11	$ 0.02	$ (1.29)	$ 0.2
Shares used in the computation of earnings (loss) per share
Basic	21,182,268	21,299,098	21,189,641,000	21,292,523
Diluted	21,440,570	21,574,155	21,189,641,000	21,560,678

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (loss)	$ (27,226)	$ 4,475
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Bad debt expense	96	(15)
Deferred financing cost amortization	142	172
Depreciation and amortization	4,269	4,378
Loss (gain) on sale of assets	(34)	(13)
Deferred income taxes	33,584	2,675
Non-cash compensation	(111)	926
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	14,945	(435)
Inventories	(665)	(3,252)
Costs and estimated earnings in excess of billings	(1,921)	(3,491)
Prepaid expenses and other current assets	97	(5,642)
Other non-current assets	(52)	594
Accounts payable and accrued expenses	(10,081)	213
Billings in excess of costs and estimated earnings	(2,098)	1,483
Other non-current liabilities	214	587
Net cash provided by operating activities	11,159	2,655
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(2,327)	(2,891)
Proceeds from sale of property and equipment	94	23
Consideration for acquisitions	(175)	(11,663)
Net cash used in investing activities	(2,408)	(14,531)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings of debt	68	5,050
Repayments of debt	(109)	(5,053)
Contingent consideration payment		(448)
Distribution to noncontrolling interest	(69)	(122)
Options exercised	11	87
Purchase of treasury stock	(1,229)	(14)
Net cash used in financing activities	(1,328)	(500)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	7,423	(12,376)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, BEGINNING BALANCE	28,290	33,221
CASH, CASH EQUIVALENTS and RESTRICTED CASH, ENDING BALANCE	35,713	20,845
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	788	660
Cash paid for income taxes	$ 1,456	$ 1,685

Business

6 Months Ended

Mar. 31, 2018

Business [Abstract]

Description of the Business

1. BUSINESS AND ACCOUNTING POLICIES

Description of the Business

IES Holdings, Inc. is a holding company that owns and manages operating subsidiaries in business activities across a variety of end markets. Our operations are currently organized into four principal business segments, based upon the nature of our current services:

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.
Communications – Nationwide provider of technology infrastructure products and services to large corporations and independent businesses.
Infrastructure Solutions – Provider of electro-mechanical solutions for industrial operations.
Residential – Regional provider of electrical installation services for single-family housing and multi-family apartment complexes.

The words “IES”, the “Company”, “we”, “our”, and “us” refer to IES Holdings, Inc. and, except as otherwise specified herein, to our wholly-owned subsidiaries.

Seasonality and Quarterly Fluctuations

Results of operations from our Residential construction segment are seasonal, depending on weather trends, with typically higher revenues generated during spring and summer and lower revenues generated during fall and winter, with an impact from precipitation in the warmer months. The Commercial & Industrial, Communications and Infrastructure Solutions segments of our business are less subject to seasonal trends, as work in these segments generally is performed inside structures protected from the weather, although weather can still impact these businesses, especially in the early stages of projects. Our service and maintenance business is generally not affected by seasonality. Our volume of business may be adversely affected by declines in construction projects resulting from adverse regional or national economic conditions. Quarterly results may also be materially affected by the timing of new construction projects. Results for our Infrastructure Solutions segment may be affected by the timing of outages at our customers’ facilities. Accordingly, operating results for any fiscal period are not necessarily indicative of results that may be achieved for any subsequent fiscal period.

Basis of Financial Statement Preparation

The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of IES, its wholly-owned subsidiaries, and entities that we control due to ownership of a majority of voting interest and have been prepared in accordance with the instructions to interim financial reporting as prescribed by the Securities and Exchange Commission (the “SEC”). The results for the interim periods are not necessarily indicative of results for the entire year. These interim financial statements do not include all disclosures required by U.S. generally accepted accounting principles (“GAAP”), and should be read in conjunction with the consolidated financial statements and notes thereto filed with the SEC in our Annual Report on Form 10-K for the fiscal year ended September 30, 2017. In the opinion of management, the unaudited Condensed Consolidated Financial Statements contained in this report include all known accruals and adjustments necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods reported herein. Any such adjustments are of a normal recurring nature.

Noncontrolling Interest

In connection with our acquisitions of STR Mechanical, LLC (“STR Mechanical”) in fiscal 2016 and NEXT Electric, LLC (“NEXT Electric”) in fiscal 2017, 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 seller. The interests retained by those third party sellers are identified on our Condensed 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 ASC 810 and the redemption amounts assuming the noncontrolling interests were redeemable at the balance sheet date. If all of these interests had been redeemable at March 31, 2018, the redemption amount would have been $1,995. See Note 13, “Business Combinations” for further discussion. For the six months ended March 31, 2018, we recorded an increase to retained earnings of $44 to decrease the carrying amount of the noncontrolling interest in STR to the balance determined under ASC 810, as if it had been redeemable at March 31, 2018, the redemption amount would have been less than the carrying amount.

Use of Estimates

The preparation of financial statements in conformity with 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, investments, intangible assets and long-lived asset impairments and adjustments, allowance for doubtful accounts receivable, stock-based compensation, reserves for legal matters, realizability of deferred tax assets, unrecognized tax benefits and self-insured claims liabilities and related reserves.

Income Taxes

In December 2017, the Tax Cuts and Jobs Act (the “Act”) was enacted, which, among other changes, reduced the federal statutory corporate tax rate from 35% to 21%, effective January 1, 2018. As a result of this change, the Company’s statutory tax rate for fiscal 2018 will be a blended rate of 24.53% and will decrease to 21% thereafter. For the six months ended March 31, 2018, our effective tax rate differed from the statutory tax rate as a result of a preliminary charge of $31,487 to re-measure our deferred tax assets and liabilities to reflect the estimated impact of the new statutory tax rate. This preliminary charge is subject to completion of our analysis of the impact of the Act, including as it relates to future deductions for executive compensation expense, as well as the effect of changes in the utilization of net deferred tax assets that reverse in fiscal 2018 as compared to subsequent years.

Accounting Standards Not Yet Adopted

In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, Revenue from Contracts with Customers, a comprehensive new revenue recognition standard which will supersede previous existing revenue recognition guidance. The standard creates a five-step model for revenue recognition that requires companies to exercise judgment when considering contract terms and relevant facts and circumstances. The standard also requires expanded disclosures surrounding revenue recognition. The effective date will be the first quarter of our fiscal year ended September 30, 2019. The standard allows for either full retrospective or modified retrospective adoption, and we plan to use the modified retrospective basis on the adoption date. We are continuing to evaluate the impact of the adoption of this standard on our Condensed Consolidated Financial Statements. In particular, we continue to analyze areas including contract termination provisions, customer furnished materials, accounting for change orders, and accounting for commissions paid. We expect that we will continue to recognize revenues for most of our fixed-price contracts over time, as services are performed, although we have identified a limited number of arrangements where we currently recognize revenue over time, but will no longer do so under the new standard. We are also continuing to assess the necessary changes in processes and controls to meet the disclosure requirements of the new standard.

In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). Under ASU 2016-02, lessees will need to recognize a right-of-use asset and a lease liability for all of their 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 will result in straight-line expense, similar to current operating leases, while finance leases will result in a front-loaded pattern, similar to current capital leases. ASU 2016-02 becomes effective for the fiscal year ended September 30, 2020. We are currently evaluating the impact it will have on our Condensed Consolidated Financial Statements.

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (“ASU 2017-01”). This standard clarifies the definition of a business to assist entities with evaluation of whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The new standard is effective for interim and annual reporting periods beginning after December 15, 2017. The prospective transition method will be required for this new guidance.

In May 2017, the FASB issued ASU No. 2017-09, Compensation—Stock Compensation (“ASU 2017-09”), to reduce the diversity in practice and the cost and complexity when changing the terms or conditions of a share-based payment award. This update is effective for interim and annual financial reporting periods beginning after December 15, 2017, although early adoption is permitted. The prospective transition method will be required for this new guidance.

We do not expect ASU 2017-01 or ASU 2017-09 to have a material effect on our Condensed Consolidated Financial Statements.

Controlling Shareholder	6 Months Ended
Controlling Shareholder	Mar. 31, 2018
Controlling Shareholder [Abstract]
Controlling Shareholder	2. CONTROLLING SHAREHOLDER At March 31, 2018, Tontine Capital Partners, L.P., together with its affiliates (collectively, “Tontine”), was the Company’s controlling shareholder, owning approximately 58% of the Company’s outstanding common stock according to a Form 4 filed with the SEC by Tontine on January 4, 2018. 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 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 net operating losses (“NOLs”) for federal and state income tax purposes. On November 8, 2016, the Company implemented a new tax benefit protection plan (the “NOL Rights Plan”). The NOL Rights Plan was designed to deter an acquisition of the Company's stock in excess of a threshold amount that could trigger a change of control within the meaning of Internal Revenue Code Section 382. There can be no assurance that the NOL Rights Plan will be effective in deterring a change of ownership or protecting the NOLs. Furthermore, a change in control would trigger the change of control provisions in a number of our material agreements, including our credit facility, bonding agreements with our sureties and our severance arrangements. Jeffrey L. Gendell was appointed as a member of the Board of Directors and as non-executive Chairman of the Board in 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 the Board of Directors since February 2012 and as Interim Director of Operations of the Company since November 2017, and who previously served as non-executive Vice Chairman of the Board from November 2016 to November 2017 and as non-executive 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, LLC, an affiliate of Tontine, for corporate office space in Greenwich, Connecticut. The lease was renewed for a three-year term in April 2016 with an increase in the monthly rent to $8, reflecting the increase paid by Tontine Associates, LLC to its landlord and the Company’s increased use of the corporate office space. The lease has terms at market rates and payments by the Company are at a rate consistent with that paid by Tontine Associates, LLC to its landlord.

Debt	6 Months Ended
Debt	Mar. 31, 2018
Debt [Abstract]
Debt	3. DEBT At March 31, 2018, and September 30, 2017, our long-term debt of $29,570 and $29,434, respectively, primarily related to amounts drawn on our revolving credit facility. Our weighted-average annual interest rate on these borrowings was 3.53% at March 31, 2018, and 3.04% at September 30, 2017. At March 31, 2018, we also had $6,408 in outstanding letters of credit and total availability of $43,738 under this facility without violating our financial covenants. There have been no changes to the financial or other covenants disclosed in Item 7 of our Annual Report on Form 10-K for the year ended September 30, 2017. The Company was in compliance with the financial covenants as of March 31, 2018. At March 31, 2018, the carrying value of amounts outstanding on our revolving credit facility approximated fair value, as debt incurs interest at a variable rate. The fair value of the debt is classified as a Level 2 measurement.

Per Share Information

6 Months Ended

Mar. 31, 2018

Per Share Information [Abstract]

Per Share Information

4. PER SHARE INFORMATION

The following tables reconcile the components of basic and diluted earnings per share for the three and six months ended March 31, 2018, and 2017:

	Three Months Ended March 31,
	2018		2017
Numerator:
Net income attributable to common shareholders of IES Holdings, Inc.	$	2,250	$	532
Decrease in noncontrolling interest		(44)		-
Net income attributable to restricted shareholders of IES Holdings, Inc.		15		4
Net income attributable to IES Holdings, Inc.	$	2,221	$	536

Denominator:
Weighted average common shares outstanding — basic		21,182,268		21,299,098
Effect of dilutive stock options and non-vested restricted stock		258,302		275,057
Weighted average common and common equivalent shares outstanding — diluted		21,440,570		21,574,155

Earnings per share attributable to IES Holdings, Inc.:
Basic	$	0.11	$	0.02
Diluted	$	0.11	$	0.02

	Six Months Ended March 31,
	2018		2017
Numerator:
Net income (loss) attributable to common shareholders of IES Holdings, Inc.	$	(27,304)	$	4,373
Decrease in noncontrolling interest		(44)		-
Net income attributable to restricted shareholders of IES Holdings, Inc.		-		35
Net income (loss) attributable to IES Holdings, Inc.	$	(27,348)	$	4,408

Denominator:
Weighted average common shares outstanding — basic		21,189,641		21,292,523
Effect of dilutive stock options and non-vested restricted stock		-		268,155
Weighted average common and common equivalent shares outstanding — diluted		21,189,641		21,560,678

Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic	$	(1.29)	$	0.21
Diluted	$	(1.29)	$	0.20

When an entity has a net loss, it is prohibited from including potential common shares in the computation of diluted per share amounts. Accordingly, we have utilized basic shares outstanding to calculate both basic and diluted loss per share for the six months ended March 31, 2018. For the three months ended March 31, 2018, and the three and six months ended March 31, 2017, the average price of our common shares exceeded the exercise price of all of our outstanding options; therefore, all of our outstanding stock options were included in the computation of fully diluted earnings per share.

Operating Segments

6 Months Ended

Mar. 31, 2018

Operating Segments [Abstract]

Operating Segments

5. OPERATING SEGMENTS

We manage and measure performance of our business in four distinct operating segments: Commercial & Industrial, Communications, Infrastructure Solutions and Residential.

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

Segment information for the three and six months ended March 31, 2018, and 2017 is as follows:

		Three Months Ended March 31, 2018
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	65,589	$	50,244	$	23,866	$	65,978	$	-	$	205,677
Cost of services				59,068		40,892		18,842		53,035		-		171,837
Gross profit				6,521		9,352		5,024		12,943		-		33,840
Selling, general and administrative				6,849		6,201		4,637		9,688		2,272		29,647
Contingent consideration				-		-		71		-		-		71
Loss (gain) on sale of assets				(17)		(8)		6		(1)		-		(20)
Operating income (loss)			$	(311)	$	3,159	$	310	$	3,256	$	(2,272)	$	4,142
Other data:
	Depreciation and amortization expense		$	527	$	219	$	1,140	$	155	$	20	$	2,061
	Capital expenditures		$	413	$	398	$	205	$	108	$	-	$	1,124
	Total assets		$	72,559	$	60,102	$	100,884	$	47,695	$	103,747	$	384,987

		Three Months Ended March 31, 2017
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	55,272	$	61,674	$	18,793	$	67,923	$	-	$	203,662
Cost of services				52,604		52,378		14,515		52,351		-		171,848
Gross profit				2,668		9,296		4,278		15,572		-		31,814
Selling, general and administrative				5,261		6,120		4,222		10,932		3,585		30,120
Contingent Consideration				-		-		83		-		-		83
Loss (gain) on sale of assets				(8)		(1)		6		(3)		-		(6)
Operating income (loss)			$	(2,585)	$	3,177	$	(33)	$	4,643	$	(3,585)	$	1,617
Other data:
	Depreciation and amortization expense		$	306	$	171	$	1,622	$	151	$	69	$	2,319
	Capital expenditures		$	435	$	481	$	56	$	108	$	15	$	1,095
	Total assets		$	54,485	$	68,475	$	107,535	$	50,743	$	126,736	$	407,974

		Six Months Ended March 31, 2018
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	118,591	$	104,703	$	45,551	$	135,132	$	-	$	403,977
Cost of services				107,227		86,231		35,842		107,773		-		337,073
Gross profit				11,364		18,472		9,709		27,359		-		66,904
Selling, general and administrative				12,644		12,285		9,194		20,054		5,559		59,736
Contingent consideration				-		-		71		-		-		71
Loss (gain) on sale of assets				(29)		(9)		5		(1)		-		(34)
Operating income (loss)			$	(1,251)	$	6,196	$	439	$	7,306	$	(5,559)	$	7,131
Other data:
	Depreciation and amortization expense		$	1,084	$	435	$	2,383	$	296	$	71	$	4,269
	Capital expenditures		$	923	$	473	$	345	$	586	$	-	$	2,327
	Total assets		$	72,559	$	60,102	$	100,884	$	47,695	$	103,747	$	384,987

		Six Months Ended March 31, 2017
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	109,228	$	114,977	$	37,270	$	134,365	$	-	$	395,840
Cost of services				100,454		97,710		27,617		103,063		-		328,844
Gross profit				8,774		17,267		9,653		31,302		-		66,996
Selling, general and administrative				9,585		11,834		8,322		21,485		7,088		58,314
Contingent Consideration				-		-		83		-		-		83
Gain on sale of assets				(7)		(1)		(2)		(3)		-		(13)
Operating income (loss)			$	(804)	$	5,434	$	1,250	$	9,820	$	(7,088)	$	8,612
Other data:
	Depreciation and amortization expense		$	654	$	345	$	2,945	$	301	$	133	$	4,378
	Capital expenditures		$	644	$	1,560	$	137	$	347	$	203	$	2,891
	Total assets		$	54,485	$	68,475	$	107,535	$	50,743	$	126,736	$	407,974

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8981-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8971-108599

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 12
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+ Details

Stockholders' Equity

6 Months Ended

Mar. 31, 2018

Stockholders' Equity [Abstract]

Stockholders' Equity

6. 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 1,059,671 shares were available for issuance at March 31, 2018.

Stock Repurchase Program

Our Board of Directors has 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. 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 pre-set 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 79,817 shares of our common stock during the three and six months ended March 31, 2018, in open market transactions at an average price of $15.40 per share. We made no purchases of stock pursuant to this plan during the three and six months ended March 31, 2017.

Treasury Stock

During the six months ended March 31, 2018, we repurchased 79,817 shares of common stock on the open market pursuant to the repurchase program. During the six months ended March 31, 2018, we issued 520 unrestricted shares of common stock from treasury stock to members of our Board of Directors as part of their overall compensation and 1,500 unrestricted shares of common stock to satisfy the exercise of outstanding options for employees.

During the six months ended March 31, 2017, we repurchased 683 shares of common stock from our employees to satisfy minimum tax withholding requirements upon the vesting of restricted stock issued under the Equity Incentive Plan. During the six months ended March 31, 2017, we issued 1,287 unrestricted shares of common stock from treasury stock to members of our Board of Directors as part of their overall compensation and 14,750 unrestricted shares to satisfy the exercise of outstanding options.

Restricted Stock

During the three months ended March 31, 2018, and 2017, we recognized $131 and $136, respectively, in compensation expense related to our restricted stock awards. During the six months ended March 31, 2018, and 2017, we recognized $245 and $273, respectively, in compensation expense related to our restricted stock awards. At March 31, 2018, the unamortized compensation cost related to outstanding unvested restricted stock was $11.

Performance Based Phantom Cash Units

Performance based phantom cash units (“PPCUs”) are a contractual right to a cash payment of $20 per PPCU. The PPCUs will generally become vested, if at all, upon achievement of certain specified performance objectives. During the three months ended March 31, 2018, and 2017, we recognized compensation expense of zero and $58, respectively, related to these units. During the six months ended March 31, 2018, and 2017, we recognized compensation expense of zero and $193, respectively, related to these units.

Phantom Stock Units

Phantom stock units (“PSUs”) are primarily granted to the members of the Board of Directors as part of their overall compensation. These PSUs 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. During the three months ended March 31, 2018, and 2017, we recognized $49 and $40, respectively, in compensation expense related to these grants. During the six months ended March 31, 2018, and 2017, we recognized $91 and $84, respectively, in compensation expense related to these grants.

Performance Based Phantom Stock Units

A performance based phantom stock unit (a “PPSU”) is a contractual right to receive one share of the Company’s common stock upon the achievement of certain specified performance objectives and continued performance of services. At March 31, 2018, the Company had outstanding an aggregate of 399,027 three-year PPSUs. The vesting of these awards is subject to the achievement of specified levels of cumulative net income before taxes or specified stock price levels and continued performance of services through mid-December 2018. At March 31, 2018, redemption of a portion of the awards is deemed probable. During the three and six months ended March 31, 2018, we recognized a benefit to compensation expense of $652 and $449, respectively, related to these grants. This benefit is a result of a reduction in the estimated number of units deemed probable of vesting, based on the projected achievement of specified performance objectives. During the three and six months ended March 31, 2017, we recognized compensation expense of $225 and $528, respectively, related to these grants.

- 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.

+ References

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+ Details

Securities and Equity Investments

6 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Cost And Equity Method Investments

7. SECURITIES AND EQUITY INVESTMENTS

Our financial instruments consist of cash and cash equivalents, accounts receivable, notes receivable, investments, accounts payable and a loan agreement. We believe that the carrying value of these financial instruments in the accompanying Condensed Consolidated Balance Sheets approximates their fair value due to their short-term nature. Additionally, we have a cost method investment in EnerTech Capital Partners II L.P. (“EnerTech”). We estimate the fair value of our investment in EnerTech (Level 3) using cash flow projections and market multiples of the underlying non-public companies.

Investment in EnerTech

The following table presents the reconciliation of the carrying value to the fair value of the investment in EnerTech as of March 31, 2018, and September 30, 2017:

	March 31,		September 30,
	2018		2017
Carrying value	$	558	$	558
Unrealized gains		170		171
Fair value	$	728	$	729

At each reporting date, the Company performs an evaluation of impairment for securities to determine if any unrealized losses are other-than temporary. Based on the results of this evaluation, we believe the unrealized gain at March 31, 2018, and September 30, 2017, indicated our investment was not impaired.

Employee Benefit Plans	6 Months Ended
Employee Benefit Plans	Mar. 31, 2018
Employee Benefit Plans [Abstract]
401(k) and Retirement Plans	8. EMPLOYEE BENEFIT PLANS 401(k) Plan The Company offers employees the opportunity to participate in its 401(k) savings plans. During the three months ended March 31, 2018 and 2017, we recognized $485 and $315, respectively, in matching expense. During the six months ended March 31, 2018 and 2017, we recognized $914 and $459, respectively, in matching expense. Post Retirement Benefit Plans Certain individuals at one of the Company’s locations are entitled to receive fixed annual payments pursuant to post retirement benefit plans. We had an unfunded benefit liability of $775 recorded as of March 31, 2018, and $815 as of September 30, 2017, related to such plans.

Fair Value Measurements

6 Months Ended

Mar. 31, 2018

Fair Value Measurements [Abstract]

Fair Value Measurements

9. FAIR VALUE MEASUREMENTS

Fair Value Measurement Accounting

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 the asset or liability is (1) 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. Considerable 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.

At March 31, 2018, financial assets and liabilities measured at fair value on a recurring basis were limited to our Executive Deferred Compensation Plan, under which certain employees are permitted to defer a portion of their base salary and/or bonus for a Plan Year (as defined in the plan), and contingent consideration liabilities related to certain of our acquisitions.

Financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2018, and September 30, 2017, are summarized in the following tables by the type of inputs applicable to the fair value measurements:

	March 31, 2018
			Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable Inputs (Level 3)
Executive savings plan assets		$	686	$	686	$	-
Executive savings plan liabilities			(572)		(572)		-
Contingent consideration			(467)		-		(467)
Total		$	(353)	$	114	$	(467)

	September 30, 2017
			Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable Inputs (Level 3)
Executive savings plan assets		$	641	$	641	$	-
Executive savings plan liabilities			(529)		(529)		-
Contingent consideration			(786)		-		(786)
Total		$	(674)	$	112	$	(786)

In fiscal years 2016 and 2017, we entered into contingent consideration arrangements related to certain acquisitions. Please see Note 13, “Business Combinations” for further discussion. At March 31, 2018, we estimated the fair value of these contingent consideration liabilities at $467. The table below presents a reconciliation of the fair value of these obligations, which used significant unobservable inputs (Level 3).

		Contingent Consideration Agreements

Fair Value at September 30, 2017	$	786
Settlements		(390)
Net Adjustments to Fair Value		71
Fair Value at March 31, 2018	$	467

- 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

6 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventory Disclosure

10. INVENTORY

Inventories consist of the following components:

	March 31,		September 30,
	2018		2017
Raw materials	$	3,414	$	4,104
Work in process		4,197		3,731
Finished goods		1,605		1,692
Parts and supplies		8,374		7,396
Total inventories	$	17,590	$	16,923

Goodwill and Intangible Assets

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill And Intangible Assets Disclosure

11. GOODWILL AND INTANGIBLE ASSETS

Goodwill

The following is a progression of goodwill by segment for the six months ended March 31, 2018:

	Commercial &		Infrastructure
	Industrial		Solutions		Residential		Total
Goodwill at September 30, 2017	$	7,176	$	30,886	$	8,631	$	46,693
Adjustments		-		45		-		45
Goodwill at March 31, 2018	$	7,176	$	30,931	$	8,631	$	46,738

Intangible Assets

Intangible assets consist of the following:

		March 31, 2018
	Estimated
	Useful Lives		Gross Carrying		Accumulated
	(in Years)		Amount		Amortization	Net
Trademarks/trade names	5 - 20	$	4,643	$	622	$	4,021
Technical library	20		400		91		309
Customer relationships	6 - 15		31,229		6,234		24,995
Backlog	1		2,412		2,412		-
Construction contracts	1		2,399		2,209		190
Total		$	41,083	$	11,568	$	29,515

		September 30, 2017
	Estimated
	Useful Lives		Gross Carrying		Accumulated
	(in Years)		Amount		Amortization	Net
Trademarks/trade names	5 - 20	$	4,643	$	440	$	4,203
Technical library	20		400		81		319
Customer relationships	6 - 15		31,115		4,741		26,374
Backlog	1		2,412		2,130		282
Construction contracts	1		2,399		2,164		235
Total		$	40,969	$	9,556	$	31,413

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Commitments And Contingencies

6 Months Ended

Mar. 31, 2018

Commitments And Contingencies [Abstract]

Legal Matters

12. 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.

The following is a discussion of our significant legal matters:

Capstone Construction Claims

From 2003 to 2005, two of our former subsidiaries performed HVAC and electrical work under contract with Capstone Building Corporation (“Capstone”) on a university student housing project in Texas. In 2005, our subsidiaries filed for arbitration against Capstone, seeking payment for work performed, change orders and other impacts. The parties settled those claims, and the release included a waiver of warranties associated with any of the HVAC work. Several years later, the subsidiaries discontinued operations, and the Company sold their assets.

On October 24, 2013, Capstone filed a petition in the 12th Judicial District Court of Walker County, Texas against these subsidiaries, among other subcontractors, seeking contribution, defense, indemnity and damages for breach of contract in connection with alleged construction defect claims brought against Capstone by the owner of the student housing project. The owner claimed $10,406 in damages, plus attorneys’ fees and costs against Capstone, which Capstone sought to recover from the subcontractors. The claims against the Company were based on alleged defects in the mechanical design, construction and installation of the HVAC and electrical systems performed by our former subsidiaries.

Following mediation in June and November 2017, the Company reached an agreement in late December 2017 to settle all claims brought against it. In the six months ended March 31, 2018, a mutual settlement and release agreement was executed by the plaintiffs and the Company resulting in a charge and payment by the Company of $200.

USAMRIID Claim

On December 6, 2017, IES Commercial, Inc. filed suit in the United States District Court of Maryland in the matter USA for the use and benefit of IES Commercial, Inc. and IES Commercial, Inc. v. Manhattan Construction Co., Torcon, Inc., Manhattan Torcon A Joint Venture, Federal Ins. Co., Fidelity & Deposit Co. of Maryland, Zurich American Ins. Co., and Travelers Casualty & Surety Co. This suit relates to a large project which has been ongoing since 2009 and was scheduled for completion in early 2013. As the Company has previously disclosed, the Company entered into a subcontract in 2009 with Manhattan Torcon A Joint Venture to perform subcontracting services at the U.S. Army Medical Research Institute for Infectious Diseases (“USAMRIID”) replacement facility project for a contract value of approximately $61,146, subject to additions or deductions. Because of delays on the project and additional work the Company performed, the Company believes it is owed approximately $21,000 for claims incurred as of August 31, 2017, and an additional approximate $4,500 for claims the Company expects to incur from August 31, 2017, through completion of the project. On January 22, 2018, the defendants in this matter filed a motion to dismiss the suit, and on February 2, 2018, we filed our response. We are awaiting a decision on this matter.

Given the uncertainty litigation poses, the Company has not recorded any recovery in connection with this claim. There can be no assurance that the Company will prevail in this litigation matter or that, if the Company does prevail, it will receive an amount substantially similar to the amount sought or not receive a significantly lower award.

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. As a result, many of our claims are effectively self-insured. Many claims against our insurance are in the form of litigation. At March 31, 2018, and September 30, 2017, we had $6,816 and $6,204, respectively, accrued for self-insurance liabilities. We are also subject to construction defect liabilities, primarily within our Residential segment. As of March 31, 2018, and September 30, 2017, we had $230 and $218, 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 March 31, 2018, and September 30, 2017, $5,900 and $5,985, respectively, of our outstanding letters of credit was utilized to collateralize our insurance program.

Surety

As of March 31, 2018, the estimated cost to complete our bonded projects was approximately $60,114. 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 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. At both March 31, 2018, and September 30, 2017, $508 of our outstanding letters of credit were to collateralize our vendors.

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 March 31, 2018, we had no such commitments.

Business Combinations

6 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Business Combination Disclosure

13. BUSINESS COMBINATIONS

2017

The Company completed three acquisitions in the year ended September 30, 2017, for a total aggregate consideration of $20,979. See Note 18, “Business Combinations and Divestitures” in our Annual Report on Form 10-K for the year ended September 30, 2017, for further information.

Freeman Enclosure Systems, LLC – We acquired 100% of the membership interests and associated real estate of Freeman and its affiliate Strategic Edge LLC on March 16, 2017. Strategic Edge LLC was subsequently merged into Freeman, with Freeman as the surviving entity. Freeman is included in our Infrastructure Solutions segment. Freeman’s ability to manufacture custom generator enclosures has expanded our solutions offering.
Technical Services II, LLC – STR Mechanical, our 80% owned subsidiary which is consolidated, acquired all of the membership interests of Technical Services, a Chesapeake, Virginia-based provider of mechanical maintenance services, including commercial heating, ventilation and air conditioning, food service equipment, electrical and plumbing services, on June 15, 2017. Technical Services operates as a subsidiary of STR Mechanical within the Company’s Commercial & Industrial segment. The acquisition of Technical Services has expanded our geographic reach and diversified our customer base for mechanical maintenance services.
NEXT Electric, LLC – On July 14, 2017, the Company acquired 80% of the membership interests of NEXT Electric, a Milwaukee, Wisconsin-based electrical contractor specializing in the design, installation and maintenance of electrical systems for commercial, industrial, healthcare, water treatment and education end markets. NEXT Electric operates within the Company’s Commercial & Industrial segment.

The total purchase consideration for the Freeman and Technical Services acquisitions included contingent consideration payments based on the acquired company’s earnings, as defined in the applicable purchase and sale agreement. The fair value of the total contingent consideration liability for all acquisitions, including Freeman and Technical Services, was estimated at $467 at March 31, 2018, and is included in other non-current liabilities on our Condensed Consolidated Balance Sheets.

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 of Technical Services and NEXT Electric, which are derived from 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.

Unaudited Pro Forma Information

The following unaudited supplemental pro forma results of operations, calculated as if each acquisition occurred as of October 1 of the fiscal year prior to consummation, for the three and six months ended March 31, 2018, and 2017, are as follows:

	Unaudited
	Three Months Ended March 31,
	2018		2017

Revenues	$	205,677	$	210,557
Net income attributable to IES Holdings, Inc.	$	2,221	$	499

	Unaudited
	Six Months Ended March 31,
	2018		2017

Revenues	$	403,977	$	410,371
Net income (loss) attributable to IES Holdings, Inc.	$	(27,348)	$	4,212

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Subsequent Events	6 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	14. SUBSEQUENT EVENTS Acquisition of Azimuth Communications, Inc. On April 6, 2018, the Company acquired all of the outstanding capital stock of Azimuth Communications, Inc. (“Azimuth”), a Portland, Oregon-based provider of design and integration services for structured cabling, physical security, access control systems, distributed antenna systems, wireless access, and audio visual systems. Azimuth will operate within our Communications segment.

Per Share Information (Tables)

6 Months Ended

Mar. 31, 2018

Per Share Information [Abstract]

Schedule Of Earnings Per Share Basic And Diluted [Table Text Block]

	Three Months Ended March 31,
	2018		2017
Numerator:
Net income attributable to common shareholders of IES Holdings, Inc.	$	2,250	$	532
Decrease in noncontrolling interest		(44)		-
Net income attributable to restricted shareholders of IES Holdings, Inc.		15		4
Net income attributable to IES Holdings, Inc.	$	2,221	$	536

Denominator:
Weighted average common shares outstanding — basic		21,182,268		21,299,098
Effect of dilutive stock options and non-vested restricted stock		258,302		275,057
Weighted average common and common equivalent shares outstanding — diluted		21,440,570		21,574,155

Earnings per share attributable to IES Holdings, Inc.:
Basic	$	0.11	$	0.02
Diluted	$	0.11	$	0.02

	Six Months Ended March 31,
	2018		2017
Numerator:
Net income (loss) attributable to common shareholders of IES Holdings, Inc.	$	(27,304)	$	4,373
Decrease in noncontrolling interest		(44)		-
Net income attributable to restricted shareholders of IES Holdings, Inc.		-		35
Net income (loss) attributable to IES Holdings, Inc.	$	(27,348)	$	4,408

Denominator:
Weighted average common shares outstanding — basic		21,189,641		21,292,523
Effect of dilutive stock options and non-vested restricted stock		-		268,155
Weighted average common and common equivalent shares outstanding — diluted		21,189,641		21,560,678

Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic	$	(1.29)	$	0.21
Diluted	$	(1.29)	$	0.20

Operation Segments (Tables)

6 Months Ended

Mar. 31, 2018

Operating Segments [Abstract]

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

		Three Months Ended March 31, 2018
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	65,589	$	50,244	$	23,866	$	65,978	$	-	$	205,677
Cost of services				59,068		40,892		18,842		53,035		-		171,837
Gross profit				6,521		9,352		5,024		12,943		-		33,840
Selling, general and administrative				6,849		6,201		4,637		9,688		2,272		29,647
Contingent consideration				-		-		71		-		-		71
Loss (gain) on sale of assets				(17)		(8)		6		(1)		-		(20)
Operating income (loss)			$	(311)	$	3,159	$	310	$	3,256	$	(2,272)	$	4,142
Other data:
	Depreciation and amortization expense		$	527	$	219	$	1,140	$	155	$	20	$	2,061
	Capital expenditures		$	413	$	398	$	205	$	108	$	-	$	1,124
	Total assets		$	72,559	$	60,102	$	100,884	$	47,695	$	103,747	$	384,987

		Three Months Ended March 31, 2017
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	55,272	$	61,674	$	18,793	$	67,923	$	-	$	203,662
Cost of services				52,604		52,378		14,515		52,351		-		171,848
Gross profit				2,668		9,296		4,278		15,572		-		31,814
Selling, general and administrative				5,261		6,120		4,222		10,932		3,585		30,120
Contingent Consideration				-		-		83		-		-		83
Loss (gain) on sale of assets				(8)		(1)		6		(3)		-		(6)
Operating income (loss)			$	(2,585)	$	3,177	$	(33)	$	4,643	$	(3,585)	$	1,617
Other data:
	Depreciation and amortization expense		$	306	$	171	$	1,622	$	151	$	69	$	2,319
	Capital expenditures		$	435	$	481	$	56	$	108	$	15	$	1,095
	Total assets		$	54,485	$	68,475	$	107,535	$	50,743	$	126,736	$	407,974

		Six Months Ended March 31, 2018
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	118,591	$	104,703	$	45,551	$	135,132	$	-	$	403,977
Cost of services				107,227		86,231		35,842		107,773		-		337,073
Gross profit				11,364		18,472		9,709		27,359		-		66,904
Selling, general and administrative				12,644		12,285		9,194		20,054		5,559		59,736
Contingent consideration				-		-		71		-		-		71
Loss (gain) on sale of assets				(29)		(9)		5		(1)		-		(34)
Operating income (loss)			$	(1,251)	$	6,196	$	439	$	7,306	$	(5,559)	$	7,131
Other data:
	Depreciation and amortization expense		$	1,084	$	435	$	2,383	$	296	$	71	$	4,269
	Capital expenditures		$	923	$	473	$	345	$	586	$	-	$	2,327
	Total assets		$	72,559	$	60,102	$	100,884	$	47,695	$	103,747	$	384,987

		Six Months Ended March 31, 2017
			Commercial &				Infrastructure
			Industrial		Communications		Solutions		Residential		Corporate		Total
Revenues			$	109,228	$	114,977	$	37,270	$	134,365	$	-	$	395,840
Cost of services				100,454		97,710		27,617		103,063		-		328,844
Gross profit				8,774		17,267		9,653		31,302		-		66,996
Selling, general and administrative				9,585		11,834		8,322		21,485		7,088		58,314
Contingent Consideration				-		-		83		-		-		83
Gain on sale of assets				(7)		(1)		(2)		(3)		-		(13)
Operating income (loss)			$	(804)	$	5,434	$	1,250	$	9,820	$	(7,088)	$	8,612
Other data:
	Depreciation and amortization expense		$	654	$	345	$	2,945	$	301	$	133	$	4,378
	Capital expenditures		$	644	$	1,560	$	137	$	347	$	203	$	2,891
	Total assets		$	54,485	$	68,475	$	107,535	$	50,743	$	126,736	$	407,974

Securities and Equity Investments (Tables)

6 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Cost Method Investments [Table Text Block]

	March 31,		September 30,
	2018		2017
Carrying value	$	558	$	558
Unrealized gains		170		171
Fair value	$	728	$	729

Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]

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

	March 31, 2018
			Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable Inputs (Level 3)
Executive savings plan assets		$	686	$	686	$	-
Executive savings plan liabilities			(572)		(572)		-
Contingent consideration			(467)		-		(467)
Total		$	(353)	$	114	$	(467)

	September 30, 2017
			Total Fair Value		Quoted Prices (Level 1)		Significant Unobservable Inputs (Level 3)
Executive savings plan assets		$	641	$	641	$	-
Executive savings plan liabilities			(529)		(529)		-
Contingent consideration			(786)		-		(786)
Total		$	(674)	$	112	$	(786)

Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Text Block]

		Contingent Consideration Agreements

Fair Value at September 30, 2017	$	786
Settlements		(390)
Net Adjustments to Fair Value		71
Fair Value at March 31, 2018	$	467

Inventory (Tables)

6 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule Of Inventory Current [Table Text Block]

	March 31,		September 30,
	2018		2017
Raw materials	$	3,414	$	4,104
Work in process		4,197		3,731
Finished goods		1,605		1,692
Parts and supplies		8,374		7,396
Total inventories	$	17,590	$	16,923

Goodwill and Intangible Assets (Tables)

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	Commercial &		Infrastructure
	Industrial		Solutions		Residential		Total
Goodwill at September 30, 2017	$	7,176	$	30,886	$	8,631	$	46,693
Adjustments		-		45		-		45
Goodwill at March 31, 2018	$	7,176	$	30,931	$	8,631	$	46,738

Schedule Of Intangible Assets And Goodwill [Table Text Block]

		March 31, 2018
	Estimated
	Useful Lives		Gross Carrying		Accumulated
	(in Years)		Amount		Amortization	Net
Trademarks/trade names	5 - 20	$	4,643	$	622	$	4,021
Technical library	20		400		91		309
Customer relationships	6 - 15		31,229		6,234		24,995
Backlog	1		2,412		2,412		-
Construction contracts	1		2,399		2,209		190
Total		$	41,083	$	11,568	$	29,515

		September 30, 2017
	Estimated
	Useful Lives		Gross Carrying		Accumulated
	(in Years)		Amount		Amortization	Net
Trademarks/trade names	5 - 20	$	4,643	$	440	$	4,203
Technical library	20		400		81		319
Customer relationships	6 - 15		31,115		4,741		26,374
Backlog	1		2,412		2,130		282
Construction contracts	1		2,399		2,164		235
Total		$	40,969	$	9,556	$	31,413

Business Combinations (Tables)

6 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Pro Forma Results of Operations

	Unaudited
	Three Months Ended March 31,
	2018		2017

Revenues	$	205,677	$	210,557
Net income attributable to IES Holdings, Inc.	$	2,221	$	499

	Unaudited
	Six Months Ended March 31,
	2018		2017

Revenues	$	403,977	$	410,371
Net income (loss) attributable to IES Holdings, Inc.	$	(27,348)	$	4,212

Business (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Business (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2018	Sep. 30, 2017
Income Taxes [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		21.00%	35.00%
Blended Federal Statutory Rate		24.53%
Income Tax Reconciliation Change In Enacted Tax Rate		$ 31,487
Business Acquisition [Line Items]
Minority Interest Change in Redemption Value	$ (44)	$ (44)
Commercial & Industrial [Member]
Business Acquisition [Line Items]
MinorityInterestOwnershipPercentageByNoncontrollingOwners	20.00%	20.00%
Minority Interest Redemption Value	$ 1,995	$ 1,995

Controlling Shareholder (Details) - Tontine [Member]	6 Months Ended
Controlling Shareholder (Details) - Tontine [Member]	Mar. 31, 2018
Related Party Transaction [Line Items]
Related Party Lease	The Company is party to a sublease agreement with Tontine Associates, LLC, an affiliate of Tontine, for corporate office space in Greenwich, Connecticut. The lease was renewed for a three-year term in April 2016 with an increase in the monthly rent to $8
Ownership Percentage Of Common Stock	58.00%

- Definition

A description of the related party transaction, including transactions to which no amounts or nominal amounts were ascribed and such other information deemed necessary to an understanding of the effects of the transactions on the financial statements. Examples of common related party transactions are, sales, purchases and transfers of realty and personal property, services received or furnished, loans and leases to and from top management and affiliates.

+ References + Details

Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Debt [Abstract]
Long-term Debt, Excluding Current Maturities	$ 29,570	$ 29,434
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Line Of Credit Facility Interest Rate At Period End	3.53%	3.04%
Letters of Credit Outstanding, Amount	$ 6,408
Excess Availability	$ 43,738

Per Share Information EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net income (loss) attributable to common shareholders of IES Holdings, Inc.	$ 2,250	$ 532	$ (27,304)	$ 4,373
Net income attributable to restricted shareholders of IES Holdings, Inc.	15	4		35
Net Income (loss)	$ 2,221	$ 536	$ (27,348)	$ 4,408
Weighted Average Number of Shares Outstanding, Basic	21,182,268	21,299,098	21,189,641,000	21,292,523
Effect of dilutive stock options and non-vested restricted stock	258,302	275,057		268,155
Weighted Average Number of Shares Outstanding, Diluted	21,440,570	21,574,155	21,189,641,000	21,560,678
Earnings (loss) per share attributable to IES Holdings, Inc.:
Earnings (loss) Per Share, Basic	$ 0.11	$ 0.02	$ (1.29)	$ 0.21
Earnings (loss) Per Share, Diluted	$ 0.11	$ 0.02	$ (1.29)	$ 0.2
Minority Interest Change in Redemption Value	$ (44)		$ (44)

Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Operating Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 205,677	$ 203,662	$ 403,977	$ 395,840
Cost of services	171,837	171,848	337,073	328,844
Gross profit	33,840	31,814	66,904	66,996
Selling, general and administrative expenses	29,647	30,120	59,736	58,314
Contingent consideration expense	71	83	71	83
Loss (gain) on sale of assets	(20)	(6)	(34)	(13)
Operating income (loss)	4,142	1,617	7,131	8,612
Depreciation and amortization	2,061	2,319	4,269	4,378
Capital expenditures	1,124	1,095	2,327	2,891
Assets	384,987	407,974	384,987	407,974	$ 424,494
Commercial & Industrial [Member]
Segment Reporting Information [Line Items]
Revenues	65,589	55,272	118,591	109,228
Cost of services	59,068	52,604	107,227	100,454
Gross profit	6,521	2,668	11,364	8,774
Selling, general and administrative expenses	6,849	5,261	12,644	9,585
Loss (gain) on sale of assets	(17)	(8)	(29)	(7)
Operating income (loss)	(311)	(2,585)	(1,251)	(804)
Depreciation and amortization	527	171	1,084	654
Capital expenditures	413	481	923	644
Assets	72,559	54,485	72,559	54,485
Communications [Member]
Segment Reporting Information [Line Items]
Revenues	50,244	61,674	104,703	114,977
Cost of services	40,892	52,378	86,231	97,710
Gross profit	9,352	9,296	18,472	17,267
Selling, general and administrative expenses	6,201	6,120	12,285	11,834
Loss (gain) on sale of assets	(8)	(1)	(9)	(1)
Operating income (loss)	3,159	3,177	6,196	5,434
Depreciation and amortization	219	171	435	345
Capital expenditures	398	481	473	1,560
Assets	60,102	68,475	60,102	68,475
Infrastructure Solutions [Member]
Segment Reporting Information [Line Items]
Revenues	23,866	18,793	45,551	37,270
Cost of services	18,842	14,515	35,842	27,617
Gross profit	5,024	4,278	9,709	9,653
Selling, general and administrative expenses	4,637	4,222	9,194	8,322
Contingent consideration expense	71	83	71	83
Loss (gain) on sale of assets	6	6	5	(2)
Operating income (loss)	310	(33)	439	1,250
Depreciation and amortization	1,140	1,622	2,383	2,945
Capital expenditures	205	56	345	137
Assets	100,884	107,535	100,884	107,535
Residential [Member]
Segment Reporting Information [Line Items]
Revenues	65,978	67,923	135,132	134,365
Cost of services	53,035	52,351	107,773	103,063
Gross profit	12,943	15,572	27,359	31,302
Selling, general and administrative expenses	9,688	10,932	20,054	21,485
Loss (gain) on sale of assets	(1)	(3)	(1)	(3)
Operating income (loss)	3,256	4,643	7,306	9,820
Depreciation and amortization	155	151	296	301
Capital expenditures	108	108	586	347
Assets	47,695	50,743	47,695	50,743
Corporate [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Cost of services	0	0
Gross profit	0	0
Selling, general and administrative expenses	2,272	3,585	5,559	7,088
Loss (gain) on sale of assets	0	0
Operating income (loss)	(2,272)	(3,585)	(5,559)	(7,088)
Depreciation and amortization	20	69	71	133
Capital expenditures	0	15		203
Assets	$ 103,747	$ 126,736	$ 103,747	$ 126,736

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	100,000,000			100,000,000		100,000,000
Common Stock, Shares, Outstanding	21,259,178			21,259,178		21,336,975
Common shares repurchased for tax withholding					683
The 2006 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	3,000,000			3,000,000
Common shares repurchased for tax withholding					683
Available Common Stock Authorized Shares	1,059,671			1,059,671
The 2015 Stock Repurchase Program [Member]
Equity Class Of Treasury Stock [Line Items]
Approved Number of shares to be repurchased	1,500,000			1,500,000
Treasury Stock Shares Acquired	79,817			79,817
Average Share Price	$ 15.4			$ 15.4
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	$ 131		$ 136	$ 245	$ 273
Unamortized compensation cost	11			11
Performance Cash Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense			58	$ 0	193
Description of Share Based Award Type				PPCUs are a contractual right to cash payment of $20 dollars per PPCU. The PPCUs will generally become vested, if at all, upon achievement of certain specified performance objectives and continued performance of services through mid-December 2018.
Phantom Share Units PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense	49		40	$ 91	84
Performance Based Phantom Share Units PPSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under share based compensation program		399,027		399,027
Recognized compensation expense	$ (652)		$ 225	$ (449)	528
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized compensation expense					$ 0
Unrestricted Stock [Member] \| The 2006 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under share based compensation program				1,500	14,750
Unrestricted Stock [Member] \| The 2006 Equity Incentive Plan [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under share based compensation program				520	1,287

Securities and Equity Investments - Enertech FV (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Carrying Value	$ 558	$ 558
Unrealized gains	170	171
Fair Value	$ 728	$ 729

Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Employee Benefit Plans [Abstract]
401 (k) Matching Expenses	$ 485	$ 315	$ 914	$ 459
Unfunded Benefit Liability	$ 775		$ 775		$ 815

Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Executive Savings Plan - Assets	$ 686	$ 641
Executive Savings Plan - Liabilities	(572)	(529)
Contingent Consideration Fair Value	467	786
Fair Value Net Asset (Liability)	(353)	(674)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Executive Savings Plan - Assets	686	641
Executive Savings Plan - Liabilities	(572)	(529)
Fair Value Net Asset (Liability)	114	112
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent Consideration Fair Value	467	786
Fair Value Net Asset (Liability)	$ 467	$ 786

Fair Value Measurements - Unobservable Inputs (Details) - Contingent Consideration [Member] - Fair Value, Inputs, Level 3 [Member] $ in Thousands	6 Months Ended
	Mar. 31, 2018 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value Beginning Balance	$ 786
Issuances	0
Settlements	(390)
Adjustments to Fair Value	71
Fair Value Ending Balance	$ 467

Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Inventory Disclosure [Abstract]
Raw Materials	$ 3,414	$ 4,104
Work in Process	4,197	3,731
Finished Goods	1,605	1,692
Parts and Supplies	8,374	7,396
Inventory, Net	$ 17,590	$ 16,923

Goodwill and Intangible Assets - Goodwill RollForward (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 46,693
Acquisitions	0
Divestitures	0
Goodwill Purchase Accounting Adjustments	45
Goodwill, Ending Balance	46,738
Commercial & Industrial [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	7,176
Acquisitions	0
Divestitures	0
Goodwill Purchase Accounting Adjustments	0
Goodwill, Ending Balance	7,176
Infrastructure Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	30,886
Acquisitions	0
Divestitures	0
Goodwill Purchase Accounting Adjustments	45
Goodwill, Ending Balance	30,931
Residential [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	8,631
Acquisitions	0
Divestitures	0
Goodwill Purchase Accounting Adjustments	0
Goodwill, Ending Balance	$ 8,631

Goodwil and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 41,083	$ 40,969
Accumulated Amortization	11,568	9,556
Intangible assets, net	29,515	31,413
Trademarks And Trade Names [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	4,643	4,643
Accumulated Amortization	622	440
Intangible assets, net	$ 4,021	$ 4,203
Trademarks And Trade Names [Member] \| Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	20 years	20 years
Trademarks And Trade Names [Member] \| Minimum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	5 years	5 years
Technical Library [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 400	$ 400
Accumulated Amortization	91	81
Intangible assets, net	$ 309	$ 319
Technical Library [Member] \| Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	20 years	20 years
Customer Relationships [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 31,229	$ 31,115
Accumulated Amortization	6,234	4,741
Intangible assets, net	$ 24,995	$ 26,374
Customer Relationships [Member] \| Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	15 years	15 years
Customer Relationships [Member] \| Minimum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	6 years	6 years
Order Backlog [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 2,412	$ 2,412
Accumulated Amortization	2,412	2,130
Intangible assets, net	$ 0	$ 282
Order Backlog [Member] \| Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	1 year	1 year
Construction Contract Value [Member]
IntangibleAssets [Line Items]
Gross Carrying Amount	$ 2,399	$ 2,399
Accumulated Amortization	2,209	2,164
Intangible assets, net	$ 190	$ 235
Construction Contract Value [Member] \| Maximum [Member]
IntangibleAssets [Line Items]
Estimated Useful Lives	1 year	1 year

Commitments And Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2018	Sep. 30, 2017	Aug. 31, 2017
Commitments And Contingencies [Abstract]
Accrued Insurance	$ 6,816	$ 6,204
Liability for Claims and Claims Adjustment Expense	230	218
Estimated cost of completion of bonded project	60,114
Insurance Related [Member]
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	5,900	5,985
Vendor Related [Member]
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	$ 508	$ 508
Capstone [Member]
Loss Contingencies [Line Items]
Loss Contingency Name Of Plaintiff	Capstone Building Corporation
Loss Contingency, Damages Sought, Value	$ 10,406
Loss Contingency Opinion Of Counsel	Following mediation in June and November 2017, the Company reached an agreement in late December 2017 to settle all claims brought against it.
Loss Contingency Accrual Payments	$ 200
USAMRIID [Member]
Loss Contingencies [Line Items]
Loss Contingency Name Of Plaintiff	IES Commercial, Inc.
Loss Contingency Opinion Of Counsel	Given the uncertainty litigation poses, the Company has not recorded any recovery in connection with this claim. There can be no assurance that the Company will prevail in this litigation matter or that, if the Company does prevail, it will receive an amount substantially similar to the amount sought or not receive a significantly lower award.
Unbilled Change Orders			$ 21,000
Contract Revenue Earned To Date	$ 61,146
USAMRIID [Member] \| Scenario Forecast [Member]
Loss Contingencies [Line Items]
Unbilled Change Orders	$ 4,500

Business Combinations (Details) $ in Thousands	6 Months Ended
Business Combinations (Details) $ in Thousands	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Contingent Consideration Fair Value	$ 467	$ 786
2017 Business Acquisitions [Member]
Business Acquisition [Line Items]
Number Of Businesses Acquired	3
Total Consideration Transferred	$ 20,979
Business Acquisition Freeman [Member] \| Infrastructure Solutions [Member]
Business Acquisition [Line Items]
Name of Acquired Business	Freeman Enclosure Systems, LLC
Description of Acquired Business	ability to manufacture custom generator enclosures
Date of Acquisition Agreement	Mar. 16, 2017
Business Acquisition Technical Services [Member] \| Commercial & Industrial [Member]
Business Acquisition [Line Items]
Name of Acquired Business	Technical Services II, LLC
Description of Acquired Business	a Chesapeake, Virginia-based provider of mechanical maintenance services, including commercial heating, ventilation and air conditioning, food service equipment, electrical and plumbing services
Date of Acquisition Agreement	Jun. 15, 2017
Minority Interest Ownership Percentage By Parent	80.00%
Business Acquisition NEXT [Member] \| Commercial & Industrial [Member]
Business Acquisition [Line Items]
Name of Acquired Business	NEXT Electric, LLC
Description of Acquired Business	a Milwaukee, Wisconsin-based electrical contractor specializing in the design, installation and maintenance of electrical systems for commercial, industrial, healthcare, water treatment and education end markets
Date of Acquisition Agreement	Jul. 14, 2017
Minority Interest Ownership Percentage By Parent	80.00%

Business Combinations - Pro Formas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Pro Forma Revenue	$ 205,677	$ 210,557	$ 403,977	$ 410,371
Pro Forma Net Income (loss) attributable to IES Holdings, Inc.	$ 2,221	$ 499	$ (27,348)	$ 4,212