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Goodwill, Written off Related to Sale of Business Unit Goodwill, Written off Related to Sale of Business Unit Adjustments to Additional Paid in Capital, Other Adjustments to Additional Paid in Capital, Other Billings in excess of costs and estimated earnings Increase (Decrease) in Contract with Customer, Liability Equity Securities, FV-NI, Noncurrent Equity Securities, FV-NI, Noncurrent Cash paid for income taxes (net) Income Taxes Paid, Net Acquisition of treasury stock, shares Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Award Timing Disclosures [Line Items] Schedule of Inventory, Current [Table Text Block] Schedule of Inventory, Current [Table Text Block] Long-Term Debt, Gross Long-Term Debt, Gross NEXT Electric NEXT Electric [Member] NEXT Electric LLC Comprehensive income attributable to IES Holdings, Inc. Net income (loss) attributable to IES Holdings, Inc. 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[Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Share-Based 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Authorized Greiner Industries Arrow Engine Company [Member] Arrow Engine Company Termination Date Trading Arrangement Termination Date Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Costs and estimated earnings in excess of billings Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Liability for Uncertainty in Income Taxes, Noncurrent Liability for Uncertainty in Income Taxes, Noncurrent Residential [Member] Residential [Member] Residential [Member] Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Cash Flow, Supplemental Disclosures Cash Flow, Supplemental Disclosures [Text Block] Cost of services Cost of Product and Service Sold Disposal Group Classification [Domain] Disposal Group Classification [Domain] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Loss Contingency, Receivable Loss Contingency, Receivable Subsequent Events [Abstract] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Line of Credit Facility, Interest Rate Description Consolidated Total Leverage Ratio Consolidated Total Leverage Ratio Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Single Family Contracts Plumbing HVAC Single Family Contracts Plumbing HVAC [Member] Single Family Contracts Plumbing HVAC Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Deferred financing cost amortization Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Undistributed Earnings (Loss) Available to Common Shareholders, Basic Undistributed Earnings (Loss) Available to Common Shareholders, Basic Cash paid for interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares, Issued Common Stock, Shares, Issued Consolidated Total Leverage Ratio, Maximum Consolidated Total Leverage Ratio, Maximum Consolidated Total Leverage Ratio, Maximum Redeemable Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] Costs and estimated earnings in excess of billings Contract with Customer, Asset, before Allowance for Credit Loss, Current 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 Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Text Block] Use of Estimates, Policy Use of Estimates, Policy [Policy Text Block] Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Loss Contingencies [Line Items] Loss Contingencies [Line Items] 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 Subsequent Events Subsequent Events [Text Block] Insider Trading 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Committed Purchase Commitment, Remaining Minimum Amount Committed Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Trademarks and Trade Names [Member] Trademarks and Trade Names [Member] Asset Class [Domain] Asset Class [Domain] Phantom Share Units (PSUs) [Member] Phantom Share Units (PSUs) [Member] Time-and-materials Contract [Member] Time-and-Materials Contract [Member] Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Unamortized Debt Issuance Expense Unamortized Debt Issuance Expense Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Subsequent Event [Line Items] Subsequent Event [Line Items] Common Stock, par value $0.01 per share Common Stock [Member] Common Stock [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]