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Per Share Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]      
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 303,058 $ 201,976 $ 92,576
Noncontrolling Interest, Period Increase (Decrease) (2,917) (17,140) (15,701)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 0 0 (11)
Comprehensive income (loss) attributable to IES Holdings, Inc. $ 305,975 $ 219,116 $ 108,288
Weighted Average Number of Shares Outstanding, Basic 19,917,463 20,160,143 20,196,850
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 265,334 254,789 216,182
Weighted Average Number of Shares Outstanding, Diluted 20,182,797 20,414,932 20,413,032
Earnings (loss) per share, basic $ 15.22 $ 10.02 $ 4.58
Earnings (loss) per share, diluted $ 15.02 $ 9.89 $ 4.54
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 4,789 0 0