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Per Share Information EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share Reconciliation [Abstract]
Net income (loss) attributable to common shareholders of IES Holdings, Inc.	$ 5,467	$ 2,250	$ 12,348	$ (27,304)
Effect of dilutive stock options and non-vested restricted stock	240,650	258,302	236,688	0
Decrease in noncontrolling interest	$ 0	$ 44	$ 0	$ 44
Net income attributable to restricted shareholders of IES Holdings, Inc.	22	15	25	0
Net income (loss) attributable to IES Holdings, Inc.	$ 5,489	$ 2,221	$ 12,373	$ (27,348)
Weighted average common shares outstanding - basic	21,139,096	21,182,268	21,187,834	21,189,641
Weighted average common and common equivalent shares sutstanding - diluted	21,379,746	21,440,570	21,424,522	21,189,641
Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic	$ 0.26	$ 0.11	$ 0.58	$ (1.29)
Diluted	$ 0.26	$ 0.11	$ 0.58	$ (1.29)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				255,146

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