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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Income Statement [Abstract]      
Revenues $ 3,371,468 $ 2,884,358 $ 2,377,227
Cost of services 2,511,971 2,187,768 1,932,688
Gross profit 859,497 696,590 444,539
Selling, general and administrative expenses 474,978 396,684 298,625
Contingent consideration 1,145 714 277
Loss (gain) on sale of assets (155) (1,684) (14,139)
Operating income 383,529 300,876 159,776
Interest Expense 1,814 1,338 3,022
Other (income) expense, net (12,170) (5,128) (1,794)
Provision for income taxes 96,805 72,165 38,761
Net income (loss) 311,842 232,501 119,787
Net Income (Loss) Attributable to Noncontrolling Interest (5,867) (13,385) (11,499)
Comprehensive income (loss) attributable to IES Holdings, Inc. $ 305,975 $ 219,116 $ 108,288
Earnings (loss) per share, basic $ 15.22 $ 10.02 $ 4.58
Earnings (loss) per share, diluted $ 15.02 $ 9.89 $ 4.54
Weighted Average Number of Shares Outstanding, Basic 19,917,463 20,160,143 20,196,850
Weighted Average Number of Shares Outstanding, Diluted 20,182,797 20,414,932 20,413,032
Provision for income taxes $ 96,805 $ 72,165 $ 38,761
Income (Loss) from Equity Method Investments (14,762) 0 0
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest 393,885 304,666 158,548
Net income (loss) $ 311,842 $ 232,501 $ 119,787
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Contingent consideration Contingent consideration