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Per Share Information EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share Reconciliation [Abstract]
Net income (loss) attributable to common shareholders of IES Holdings, Inc.									$ (14,113)	$ 13,275	$ 119,722
Increase in noncontrolling interest									(44)	44
Net income attributable to restricted shareholders of IES Holdings, Inc.									0	103	1,056
Net income (loss) attributable to IES Holdings, Inc.	$ 4,675	$ 8,516	$ 2,221	$ (29,569)	$ 3,146	$ 5,868	$ 536	$ 3,872	$ (14,157)	$ 13,422	$ 120,778
Weighted Average Number of Shares Outstanding, Basic									21,196,388	21,280,549	21,279,342
Effect of dilutive stock options and non-vested restricted stock									0	252,705	212,997
Weighted Average Number of Shares Outstanding, Diluted, Total									21,196,388	21,533,254	21,492,339
Earnings Per Share, Basic	$ 0.22	$ 0.4	$ 0.11	$ (1.39)	$ 0.15	$ 0.27	$ 0.02	$ 0.18	$ (0.67)	$ 0.62	$ 5.63
Earnings Per Share, Diluted	$ 0.22	$ 0.4	$ 0.11	$ (1.39)	$ 0.14	$ 0.27	$ 0.02	$ 0.18	$ (0.67)	$ 0.62	$ 5.62
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									301,879

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