v3.25.3

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

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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