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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 10,826	$ 8,513	$ 23,210	$ (18,788)
Noncontrolling Interest, Period Increase (Decrease)				(44)
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	146	3	135	0
Comprehensive income attributable to IES Holdings, Inc.	$ 10,972	$ 8,516	$ 23,345	$ (18,832)	$ (18,832)
Weighted Average Number of Shares Outstanding, Basic	21,043,425	21,200,635	21,139,697	21,193,306
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	257,810	131,248	242,481	0
Weighted Average Number of Shares Outstanding, Diluted	21,301,235	21,331,883	21,382,178	21,193,306
Earnings Per Share, Basic	$ 0.52	$ 0.40	$ 1.10	$ (0.89)
Earnings Per Share, Diluted	$ 0.52	$ 0.40	$ 1.09	$ (0.89)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				211,669

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