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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 8,337	$ 6,884
Noncontrolling Interest, Change in Redemption Value	45	0
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	120	0
Comprehensive income attributable to IES Holdings, Inc.	$ 8,502	$ 6,884
Weighted Average Number of Shares Outstanding, Basic	20,883,477	21,233,132
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	264,835	27,933
Weighted Average Number of Shares Outstanding, Diluted	21,148,312	21,261,065
Earnings Per Share, Basic	$ 0.40	$ 0.32
Earnings Per Share, Diluted	$ 0.39	$ 0.32

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