Per Share Information (Tables)

12 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

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

	Year Ended September 30,
	2021		2020		2019
Numerator:
Net income attributable to IES Holdings, Inc.	$	66,658	$	41,599	$	33,206
Increase in noncontrolling interest	(315)		(194)		—
Net income attributable to restricted shareholders of IES Holdings, Inc.	(56)		(575)		(256)
Net income attributable to common shareholders of IES Holdings, Inc.	$	66,287	$	40,830	$	32,950
Denominator:
Weighted average common shares outstanding — basic	20,790,307		20,795,892		21,082,012
Effect of dilutive stock options and non-vested securities	296,125		296,518		233,233
Weighted average common and common equivalent shares outstanding — diluted	21,086,432		21,092,410		21,315,245
Earnings per share attributable to common shareholders of IES Holdings, Inc.:
Basic	$	3.19	$	1.96	$	1.56
Diluted	$	3.15	$	1.94	$	1.55