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Per Share Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]      
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 92,576 $ 30,046 $ 66,287
Noncontrolling Interest, Period Increase (Decrease) (15,701) (4,695) (315)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic (11) (21) (56)
Comprehensive income (loss) attributable to IES Holdings, Inc. $ 108,288 $ 34,762 $ 66,658
Weighted Average Number of Shares Outstanding, Basic 20,196,850 20,667,745 20,790,307
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 216,182 226,880 296,125
Weighted Average Number of Shares Outstanding, Diluted 20,413,032 20,894,625 21,086,432
Earnings (loss) per share, basic $ 4.58 $ 1.45 $ 3.19
Earnings (loss) per share, diluted $ 4.54 $ 1.44 $ 3.15