Award Type [Axis] Accounts Payable and Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current, Total Accounts payable and accrued expenses Accounts receivable: Accounts Receivable, Net, Current Trade, net of allowance Accounts Receivable, Net, Current, Total Accrued Liabilities For Commissions Expense And Taxes Accrued Insurance Accrued Insurance Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income [Member] Additional Paid in Capital Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional paid-in capital Additional Paid in Capital, Total Additional Paid In Capital [Member] Additional Paid-In Capital [Member] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Non-cash compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Total Allocated Share-based Compensation Expense Recognized compensation expense Allowance for Doubtful Accounts Receivable Allowance for Doubtful Accounts Receivable Beginning Balance Allowance for Doubtful Accounts Receivable Ending Balance Allowance for Doubtful Accounts Trade, allowance Allowance for Doubtful Accounts Amortization of Financing Costs Deferred financing cost amortization Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Assets, Fair Value Disclosure Executive savings plan assets Total assets Total assets Total assets Current assets Total current assets Total current assets CURRENT ASSETS: Billings in Excess of Cost Billings in excess of costs and estimated earnings Billings in Excess of Cost, Total BusinessAcquisitionDateOfAcquisitionAgreement1 Date of Acquisition Agreement Business Combination Contingent Consideration Liability Noncurrent Contingent consideration Contingent consideration BusinessCombinationConsiderationTransferred1 Total Consideration Transferred Business Combination Consideration Transferred Liabilities Incurred Additional Consideration To Be Paid BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 Contingent Consideration Payment BusinessAcquisitionProFormaInformationAbstract Business Combination Integration Related Costs Contingent consideration BusinessAcquisitionProFormaInformationTextBlock Pro Forma Results of Operations BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax Pro Forma Net Income (loss) attributable to IES Holdings, Inc. Business Acquisition [Line Items] Business Acquisition Acquiree [Domain] BusinessAcquisitionsProFormaRevenue Pro Forma Revenue BusinessAcquisitionDescriptionOfAcquiredEntity Description of Acquired Business BusinessAcquisitionNameOfAcquiredEntity Name of Acquired Business Business Acquisition [Axis] Business Combinations [Abstract] Business Combination Disclosure [Text Block] Business Combination Disclosure Business Acquisition Purchase Price Allocation Goodwill Expected Tax Deductible Amount Goodwill Tax Basis Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual Revenues From Acquisitions Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual Operating Income From Acquisitions Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Net assets acquired Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net [Abstract] Cash and Cash Equivalents, Period Increase (Decrease) NET DECREASE IN CASH AND CASH EQUIVALENTS NET DECREASE IN CASH AND CASH EQUIVALENTS Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS, end of period CASH AND CASH EQUIVALENTS, beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of period Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Class Of Treasury Stock [Table] Class Of Stock Disclosures [Abstract] Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES Legal Matters Commitments And Contingencies [Abstract] Common Stock [Member] Common Stock [Member] Common Stock, Shares Authorized Common stock, shares authorized Common stock, par value Common Stock, Par or Stated Value Per Share Common Stock, Shares, Issued Common stock, shares issued Common Stock, Shares, Issued, Total Common stock, shares outstanding Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding Common Stock, Value, Issued, Total Common stock, $0.01 par value, 100,000,000 shares authorized Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued Employee Benefit Plans [Abstract] Compensation and Employee Benefit Plans [Text Block] 401(k) Plan 401(k) and Retirement Plans Contract With Customer Duration [Domain] Contract Receivable Retainage Contract Receivable Retainage, Total Retainage Contract With Customer Duration [Axis] Contract With Customer Asset And Liability [Table Text Block] Corporate [Member] Corporate Cost of services Cost of Services, Total Cost of services Cost And Equity Method Investments Disclosure [Text Block] Cost And Equity Method Investments Fair value Investments, Fair Value Disclosure Cost Method Investments Carrying value of our investment in EnerTech Carrying value Costs in Excess of Billings on Uncompleted Contracts or Programs Costs and estimated earnings in excess of billings Costs in Excess of Billings on Uncompleted Contracts or Programs, Total Credit Facility [Axis] Credit Facility [Domain] Cumulative Effect Of New Accounting Principle In Period Of Adoption Cumulative Effect of ASU CustomerRelationshipsMember Customer Relationships [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table Text Block] Debt [Abstract] Debt Disclosure [Text Block] DEBT AND LIQUIDITY Debt Debt, Current Debt, Current Current maturities of long-term debt Deferred income taxes Deferred income tax Deferred Income Tax Expense (Benefit), Total Deferred Tax Assets, Net, Noncurrent Deferred tax assets Deferred Tax Liabilities Deferred tax liability Deferred Tax Liabilities, Noncurrent LONG-TERM DEFERRED TAX LIABILITY DefinedContributionPlanCostRecognized 401 (k) Matching Expenses Depreciation Depreciation and amortization expense Depreciation, Depletion and Amortization, Total Depreciation, Depletion and Amortization Depreciation and amortization Depreciation, Depletion and Amortization, Total DevelopedTechnologyRightsMember Developed Technology [Member] Director [Member] Earnings Per Share Reconciliation [Abstract] Earnings Per Share [Text Block] Per Share Information Per Share Information Basic Basic Basic From continuing operations Earnings Per Share, Basic [Abstract] Basic earnings (loss) per share attributable to IES Holdings, Inc.: Earnings (loss) per share attributable to IES Holdings, Inc.: Diluted Diluted