Per Share Information (Tables)

12 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

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

	Year Ended September 30,
	2019		2018			2017
Numerator:
Net income (loss) attributable to common shareholders of IES Holdings, Inc.	$	32,950	$	(14,113	)	$	13,275
Increase (decrease) in noncontrolling interest	—		(44		)	44
Net income attributable to restricted shareholders of IES Holdings, Inc.	256		—			103
Net income (loss) attributable to IES Holdings, Inc.	$	33,206	$	(14,157	)	$	13,422
Denominator:
Weighted average common shares outstanding — basic	21,082,012		21,196,388			21,280,549
Effect of dilutive stock options and non-vested securities	233,233		—			252,705
Weighted average common and common equivalent shares outstanding — diluted	21,315,245		21,196,388			21,533,254
Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic	$	1.56	$	(0.67	)	$	0.62
Diluted	$	1.55	$	(0.67	)	$	0.62