Per Share Information (Tables)

12 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

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

	Year Ended September 30,
	2023		2022		2021
Numerator:
Net income attributable to IES Holdings, Inc.	$	108,288	$	34,762	$	66,658
Increase in noncontrolling interest	(15,701)		(4,695)		(315)
Net income attributable to restricted shareholders of IES Holdings, Inc.	(11)		(21)		(56)
Net income attributable to common shareholders of IES Holdings, Inc.	$	92,576	$	30,046	$	66,287
Denominator:
Weighted average common shares outstanding — basic	20,196,850		20,667,745		20,790,307
Effect of dilutive stock options and non-vested securities	216,182		226,880		296,125
Weighted average common and common equivalent shares outstanding — diluted	20,413,032		20,894,625		21,086,432
Earnings per share attributable to common shareholders of IES Holdings, Inc.:
Basic	$	4.58	$	1.45	$	3.19
Diluted	$	4.54	$	1.44	$	3.15