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Per Share Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]        
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 18,780 $ (6,282) $ 42,117 $ 8,116
Noncontrolling Interest, Change in Redemption Value (2,771) (870) (5,826) (930)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 0 0 (10) (6)
Net income (loss) attributable to IES Holdings, Inc. $ 21,551 $ (5,412) $ 47,953 $ 9,052
Weighted Average Number of Shares Outstanding, Basic 20,170,824 20,772,426 20,206,814 20,737,253
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements 216,972 0 207,678 402,176
Weighted Average Number of Shares Outstanding, Diluted 20,387,796 20,772,426 20,414,492 21,139,429
Earnings Per Share, Basic $ 0.93 $ (0.30) $ 2.08 $ 0.39
Earnings Per Share, Diluted $ 0.92 $ (0.30) $ 2.06 $ 0.38