Per Share Information (Tables)

12 Months Ended

Sep. 30, 2022

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Year Ended September 30,
	2022		2021		2020
Numerator:
Net income attributable to IES Holdings, Inc.	$	34,762	$	66,658	$	41,599
Increase in noncontrolling interest	(4,695)		(315)		(194)
Net income attributable to restricted shareholders of IES Holdings, Inc.	(21)		(56)		(575)
Net income attributable to common shareholders of IES Holdings, Inc.	$	30,046	$	66,287	$	40,830
Denominator:
Weighted average common shares outstanding — basic	20,667,745		20,790,307		20,795,892
Effect of dilutive stock options and non-vested securities	226,880		296,125		296,518
Weighted average common and common equivalent shares outstanding — diluted	20,894,625		21,086,432		21,092,410
Earnings per share attributable to common shareholders of IES Holdings, Inc.:
Basic	$	1.45	$	3.19	$	1.96
Diluted	$	1.44	$	3.15	$	1.94