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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic	$ 12,066	$ 10,826	$ 26,577	$ 23,210
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	194	146	416	135
Comprehensive income attributable to IES Holdings, Inc.	$ 12,260	$ 10,972	$ 26,993	$ 23,345
Weighted Average Number of Shares Outstanding, Basic	20,728,149	21,043,425	20,819,857	21,139,697
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	268,583	257,810	264,410	242,481
Weighted Average Number of Shares Outstanding, Diluted	20,996,732	21,301,235	21,084,267	21,382,178
Earnings Per Share, Basic	$ 0.58	$ 0.52	$ 1.28	$ 1.10
Earnings Per Share, Diluted	$ 0.58	$ 0.52	$ 1.26	$ 1.09

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