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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 12,207	$ 6,175	$ 24,411	$ 14,510
Noncontrolling Interest, Change in Redemption Value	621	(45)	503	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	8	101	20	223
Comprehensive income attributable to IES Holdings, Inc.	$ 12,836	$ 6,231	$ 24,934	$ 14,733
Weighted Average Number of Shares Outstanding, Basic	20,780,006	20,847,245	20,756,879	20,865,460
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	291,053	275,065	302,209	267,059
Weighted Average Number of Shares Outstanding, Diluted	21,071,059	21,122,310	21,059,088	21,132,519
Earnings Per Share, Basic	$ 0.59	$ 0.30	$ 1.18	$ 0.70
Earnings Per Share, Diluted	$ 0.58	$ 0.29	$ 1.16	$ 0.69

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