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Per Share Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Undistributed Earnings (Loss) Available to Common Shareholders, Basic									$ 32,950	$ (14,113)	$ 13,275
Noncontrolling Interest, Period Increase (Decrease)										(44)	44
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic									(256)		(103)
Comprehensive income attributable to IES Holdings, Inc.	$ 9,861	$ 10,972	$ 5,489	$ 6,884	$ 4,675	$ 8,516	$ 2,221	$ (29,569)	$ 33,206	$ (14,157)	$ 13,422
Weighted Average Number of Shares Outstanding, Basic									21,082,012	21,196,388	21,280,549
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements									233,233	0	252,705
Weighted Average Number of Shares Outstanding, Diluted									21,315,245	21,196,388	21,533,254
Earnings Per Share, Basic	$ 0.47	$ 0.52	$ 0.26	$ 0.32	$ 0.22	$ 0.40	$ 0.11	$ (1.39)	$ 1.56	$ (0.67)	$ 0.62
Earnings Per Share, Diluted	$ 0.46	$ 0.52	$ 0.26	$ 0.32	$ 0.22	$ 0.40	$ 0.11	$ (1.39)	$ 1.55	$ (0.67)	$ 0.62
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount										301,879

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