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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 14,464	$ 12,098
Noncontrolling Interest, Change in Redemption Value	60	118
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	11	12
Comprehensive income attributable to IES Holdings, Inc.	$ 14,464	$ 12,098
Weighted Average Number of Shares Outstanding, Basic	20,702,844	20,734,516
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	256,043	326,839
Weighted Average Number of Shares Outstanding, Diluted	20,958,887	21,061,355
Earnings Per Share, Basic	$ 0.70	$ 0.58
Earnings Per Share, Diluted	$ 0.69	$ 0.58

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