Total Lease, Liability, Payments, Year Three Total Lease, Liability, Payments, Year Three Total Lease, Liability, Payments, Year Three Operating long-term lease liabilities Operating Lease, Liability, Noncurrent Finance Lease, Liability, Payment, Due Finance Lease, Liability, Payment, Due Inventory, Work in Process, Gross Inventory, Work in Process, Gross Interest expense Interest Expense Finance Lease, Liability, Payments, Due Next Twelve Months Finance Lease, Liability, to be Paid, Year One Trademarks and Trade Names [Member] Trademarks and Trade Names [Member] Contingent consideration Business Combination, Integration Related Costs Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Comprehensive income attributable to IES Holdings, Inc. Net income (loss) attributable to IES Holdings, Inc. Net Income (Loss) Attributable to Parent Operating right of use assets Operating Lease, Right-of-Use Asset Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Total Lease, Liability Total Lease, Liability Total Lease, Liability Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Technical Library Other Intangible Assets [Member] Costs and estimated earnings in excess of billings Increase (Decrease) in Contract with Customer, Asset Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Finance Lease, Liability Finance Lease, Liability Share-based Payment Arrangement, Nonemployee [Member] Share-based Payment Arrangement, Nonemployee [Member] Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Share Repurchase Program [Axis] Share Repurchase Program [Axis] Backlog [Member] Order or Production Backlog [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Other non-current assets Other Assets, Noncurrent Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, to be Paid, Year Three Finance Lease, Liability, Payments, Due Year Four Finance Lease, Liability, to be Paid, Year Four Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Segments [Axis] Segments [Axis] Options exercised Proceeds from Stock Options Exercised Retirement Benefits [Abstract] Retirement Benefits [Abstract] Finance Lease, Liability, Payments, Due Year Two Finance Lease, Liability, to be Paid, Year Two Entity File Number Entity File Number Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Provision for (benefit from) income taxes Income Tax Expense (Benefit) Non-cash compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Amendment Flag Amendment Flag Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Equity Components [Axis] Equity Components [Axis] Entity Tax Identification Number Entity Tax Identification Number Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Loss (gain) on sale of assets Gain (Loss) on Disposition of Assets Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Distribution to noncontrolling interest Proceeds from (Payments to) Noncontrolling Interests Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, to be Paid Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Finance Lease, Cost Finance Lease, Cost Finance Lease, Cost Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Inventories Inventory, Net Inventory, Net Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Revenue Recognition and Deferred Revenue [Abstract] Revenue Recognition and Deferred Revenue [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, to be Paid, after Year Five Variable Lease, Cost Variable Lease, Cost Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Schedule of Inventory, Current [Table Text Block] Schedule of Inventory, Current [Table Text Block] Business Combination, Contingent Consideration, Liability, Noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Product and Service [Axis] Product and Service [Axis] Grantee Status [Axis] Grantee Status [Axis] Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Loss contingency, reserve Loss Contingency, Loss in Period Equity Component [Domain] Equity Component [Domain] Insurance Related [Member] Insurance Related [Member] Insurance Related Coverage Short-term Lease, Cost Short-term Lease, Cost Issuances under compensation plans, shares Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Total Lease, Liability, Payments, Due After Year Five Total Lease, Liability, Payments, Due After Year Five Total Lease, Liability, Payments, Due After Year Five Infrastructure Solutions [Member] Infrastructure Solutions [Member] Infrastructure Solutions [Member] Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, to be Paid, Year One Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Award Type [Domain] Award Type [Domain] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Local Phone Number Local Phone Number Noncontrolling Interest, Change in Redemption Value Noncontrolling Interest, Change in Redemption Value Noncontrolling Interest, Change in Redemption Value Statement [Line Items] Statement [Line Items] Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Other non-current liabilities Increase (Decrease) in Other Noncurrent Liabilities Billings in excess of costs and estimated earnings Increase (Decrease) in Contract with Customer, Liability Grantee Status [Domain] Grantee Status [Domain] Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Text Block] Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Preferred stock, value Preferred Stock, Value, Issued Issuances under compensation plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Equity Incentive Plan [Member] Equity Incentive Plan [Member] Equity Incentive Plan [Member] Related Party Transaction, Purchases from Related Party Related Party Transaction, Purchases from Related Party Lessee, Operating Lease, Lease Not yet Commenced, Description Operating Leases not yet Commenced Operating Leases not yet Commenced Retained Earnings [Member] Retained Earnings [Member] Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Debt Disclosure [Abstract] Debt Disclosure [Abstract] Time-and-materials Contract [Member] Time-and-materials Contract [Member] Finance Lease, Liability, Current Finance Lease, Liability, Current Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Income (loss) from operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Segment Reporting [Abstract] Segment Reporting [Abstract] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Accounts receivable Increase (Decrease) in Accounts Receivable Finance Lease, Interest Expense Finance Lease, Interest Expense Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Title of 12(b) Security Title of 12(b) Security Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Prepaid expenses and other current assets Increase (Decrease) in Other Current Assets Total assets Total assets Assets Common Stock, Shares Authorized Common Stock, Shares Authorized Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Earnings Per Share, Basic Earnings Per Share, Basic Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, to be Paid, Year Three Document Type Document Type Revenue from External Customers by Products and Services [Table Text Block] Revenue from Contract with Customer [Text Block] Product and Service [Domain] Product and Service [Domain] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Inventory, Raw Materials, Gross Inventory, Raw Materials, Gross Defined Contribution Plan, Cost Defined Contribution Plan, Cost Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Repurchase Agreements [Member] Repurchase Agreements [Member] Custom Power Solutions [Member] Custom Power Solutions [Member] Custom Power Solutions [Member] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Accounts and Other Receivables, Net, Current Accounts and Other Receivables, Net, Current Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Lease, Cost Lease, Cost [Table Text Block] Operating Lease, Payments Operating Lease, Payments Shares, vested Shares, vested Shares, vested Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Earnings Per Share, Diluted Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Cash paid for income taxes (net) Income Taxes Paid, Net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Accrued Insurance, Current Accrued Insurance, Current Assets, Fair Value Disclosure Assets, Fair Value Disclosure Corporate Segment [Member] Corporate Segment [Member] Redeemable Noncontrolling Interest, Equity, Redemption Value Redeemable Noncontrolling Interest, Equity, Redemption Value Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fixed-price Contract [Member] Fixed-price Contract [Member] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Treasury stock, value Treasury Stock, Value Entity Small Business Entity Small Business Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Total liabilities and stockholders' equity Liabilities and Equity Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Billings in excess of costs and estimated earnings Billings in excess of costs and estimated earnings Contract with Customer, Liability, Current Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, to be Paid, Year Five Noncompete Agreements [Member] Noncompete Agreements [Member] Depreciation and amortization Depreciation, Depletion and Amortization Additional paid-in capital Additional Paid in Capital Borrowings of debt Proceeds from Issuance of Long-term Debt and Capital Securities, Net Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Business Description and Basis of Presentation [Text Block] Business Description and Basis of Presentation [Text Block] Inventories Increase (Decrease) in Inventories Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Earnings Per Share [Text Block] Earnings Per Share [Text Block] Acquisition of treasury stock Treasury Stock, Value, Acquired, Cost Method Repayments of debt Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Entity Interactive Data Current Entity Interactive Data Current Cost of services Cost of Goods and Services Sold Other Long-term Debt, Noncurrent Other Long-term Debt, Noncurrent Options exercised Stock Issued During Period, Value, Stock Options Exercised Minimum [Member] Minimum [Member] Document Period End Date Document Period End Date Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Entity Central Index Key Entity Central Index Key Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Gross profit Gross profit Gross Profit Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, to be Paid, Year Two Financial and Nonfinancial Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Selling, general and administrative expenses Selling, General and Administrative Expense Lease, Cost Lease, Cost Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Proceeds from sale of assets Proceeds from Sale of Productive Assets Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Investments, Fair Value Disclosure Investments, Fair Value Disclosure Customer Relationships [Member] Customer Relationships [Member] Fair Value, Net Asset (Liability) Fair Value, Net Asset (Liability) Entity Address, State or Province Entity Address, State or Province Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Leases Lessee, Finance Leases [Text Block] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Property and equipment, net Property, Plant and Equipment, Net Shareholders' Equity and Share-based Payments [Text Block] Shareholders' Equity and Share-based Payments [Text Block] Other non-current liabilities Other Liabilities, Noncurrent Deferred tax assets Deferred Income Tax Assets, Net Total Lease, Liability, Payments, Year Five Total Lease, Liability, Payments, Year Five Total Lease, Liability, Payments, Year Five Share-based Payment Arrangement, Employee [Member] Share-based Payment Arrangement, Employee [Member] Acquisition of treasury stock, shares Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Debt Disclosure [Text Block] Debt Disclosure [Text Block] Trading Symbol Trading Symbol Shares, Outstanding Shares, Outstanding Earnings Per Share [Abstract] Earnings Per Share [Abstract] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Inventory Disclosure [Text Block] Inventory Disclosure [Text Block] Accounting Policies [Abstract] Accounting Policies [Abstract] Revenues Revenues Inventory, Finished Goods, Gross Inventory, Finished Goods, Gross Operating Lease, Liability Operating Lease, Liability Trade accounts receivable Loss Contingency Accrual Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Other Inventory, Gross Other Inventory, Gross Document Transition Report Document Transition Report Common stock, value Common Stock, Value, Issued Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Total Lease, Liability, Payments Due Total Lease, Liability, Payments Due Total Lease, Liability, Payment, Due Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Long-term debt Long-term Debt, Excluding Current Maturities NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Total Lease, Liability, Undiscounted Excess Amount Total Lease, Liability, Undiscounted Excess Amount Total Lease, Liability, Undiscounted Excess Amount Performance Based Phantom Shares [Member] Performance Shares [Member] Loans Payable to Bank, Noncurrent Loans Payable to Bank, Noncurrent Schedule of Goodwill [Table] Schedule of Goodwill [Table] Leases Lessee, Operating Leases [Text Block] Share-based Payment Arrangement, Expense Share-based Payment Arrangement, Expense Entity Emerging Growth Company Entity Emerging Growth Company Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Accounts Receivable, Allowance for Credit Loss, Current Accounts Receivable, Allowance for Credit Loss, Current Entity Current Reporting Status Entity Current Reporting Status Accounts payable and accrued expenses Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Restricted Stock [Member] Restricted Stock [Member] Compensation and Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] Entities [Table] Entities [Table] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Deferred financing cost amortization Amortization of Debt Issuance Costs Cover page. Cover [Abstract] Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements CASH, CASH EQUIVALENTS, beginning of period CASH, CASH EQUIVALENTS, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Goodwill [Line Items] Goodwill [Line Items] Shares, Issued Shares, Issued Shares, Issued Shares, Issued Class of Stock [Axis] Class of Stock [Axis] Lessee, Total Lease, Liability, Payments, Remainder of Fiscal Year [Line Items] Lessee, Total Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Total Lease, Liability, Payments, Remainder of Fiscal Year Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Single Family Contracts [Member] Single Family Contracts [Member] Single Family Type Customer Contracts industrial Services [Member] industrial Services [Member] industrial Services [Member] Treasury Stock, Shares Treasury Stock, Shares Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Common Stock, Capital Shares Reserved for Future Issuance Common Stock, Capital Shares Reserved for Future Issuance Leases [Abstract] Leases [Abstract] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Undistributed Earnings (Loss) Available to Common Shareholders, Basic Undistributed Earnings (Loss) Available to Common Shareholders, Basic Unbilled Receivables, Current Unbilled Receivables, Current Payments for Repurchase of Redeemable Noncontrolling Interest Payments for Repurchase of Redeemable Noncontrolling Interest Performance Obligation Next 12 Months Performance Obligation Next 12 Months Performance Obligation Next 12 Months Entity Address, Postal Zip Code Entity Address, Postal Zip Code Multi Family and Other [Member] Multi Family and Other [Member] Multi Family and Other Customer Contract Type Capital expenditures Capital expenditures Payments to Acquire Productive Assets Finance Lease, Liability, Payments, Due after Year Five Finance Lease, Liability, to be Paid, after Year Five Options exercised, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Cash paid in conjunction with business combinations Payments to Acquire Businesses and Interest in Affiliates ControllingShareholderOwnershipPercentage ControllingShareholderOwnershipPercentage Percentage of outstanding common stock owned by controlling shareholder Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Equity [Abstract] Equity [Abstract] Document Quarterly Report Document Quarterly Report Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, to be Paid, Year Five Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Residential [Member] Residential [Member] Residential [Member] Entity Address, Address Line One Entity Address, Address Line One Common Stock, par value $0.01 per share Common Stock [Member] Common Stock [Member] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Entity Address, Address Line Two Entity Address, Address Line Two Cash paid for interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Operating income (loss) Operating income (loss) Operating Income (Loss) Total Lease, Liability, Payments, Year Four Total Lease, Liability, Payments, Year Four Total Lease, Liability, Payments, Year Four Entity Shell Company Entity Shell Company Operating Lease, Liability, Current Operating Lease, Liability, Current Purchase Commitment, Remaining Minimum Amount Committed Purchase Commitment, Remaining Minimum Amount Committed Total current liabilities Liabilities, Current Document Fiscal Year Focus Document Fiscal Year Focus Class of Stock [Domain] Class of Stock [Domain] Shares Issued, Shares, Share-based Payment Arrangement, Forfeited Shares Issued, Shares, Share-based Payment Arrangement, Forfeited Non-cash compensation expense Share-based Payment Arrangement, Noncash Expense Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Depreciation and amortization expense Depreciation Communications [Member] Communications [Member] Communications [Member] Finance Lease, Interest Payment on Liability Finance Lease, Interest Payment on Liability Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Loss Contingencies [Table] Loss Contingencies [Table] Treasury Stock [Member] Treasury Stock [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Costs and estimated earnings in excess of billings Contract with Customer, Asset, before Allowance for Credit Loss, Current Entity Information [Line Items] Entity Information [Line Items] Other (income) expense, net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Other non-current assets Increase (Decrease) in Other Noncurrent Assets Business Combinations [Abstract] Business Combinations [Abstract] Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Maximum [Member] Maximum [Member] Commercial and Industrial [Member] Commercial and Industrial [Member] Commercial and Industrial [Member] Controlling Shareholder [Text Block] Controlling Shareholder [Text Block] Controlling Shareholder [Text Block] Cash paid for finance leases Proceeds from (Repayments of) Other Long-term Debt Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] Total liabilities Liabilities Award Type [Axis] Award Type [Axis] Goodwill Goodwill Goodwill Goodwill Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders' equity Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent Common Stock, Shares, Issued Common Stock, Shares, Issued City Area Code City Area Code Estimated cost of completion of bonded projects Estimatedcostofcompletionofbondedproject Estimated cost of completion of bonded projects Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Phantom Share Units (PSUs) [Member] Phantom Share Units (PSUs) [Member] Operating Lease, Cost Operating Lease, Cost Entity Address, City or Town Entity Address, City or Town Total Lease, Liability, Payments, Year Two Total Lease, Liability, Payments, Year Two Total Lease, Liability, Payments, Year Two Purchase of treasury stock Payments for Repurchase of Common Stock Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income taxes Deferred Income Tax Expense (Benefit)