Per Share Information (Tables)

9 Months Ended

Jun. 30, 2021

Earnings Per Share [Abstract]

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

	Three Months Ended June 30,
	2021		2020
Numerator:
Net income attributable to common stockholders of IES Holdings, Inc.	$	19,388	$	12,066
Increase (decrease) in noncontrolling interest		(103)		—
Net income attributable to restricted stockholders of IES Holdings, Inc.		16		194
Net income attributable to IES Holdings, Inc.	$	19,301	$	12,260
Denominator:
Weighted average common shares outstanding — basic		20,829,165		20,728,149
Effect of dilutive stock options and non-vested securities		258,614		268,583
Weighted average common and common equivalent shares outstanding — diluted		21,087,779		20,996,732
Earnings per share attributable to common stockholders of IES Holdings, Inc.:
Basic	$	0.93	$	0.58
Diluted	$	0.92	$	0.58

	Nine Months Ended June 30,
	2021		2020
Numerator:
Net income attributable to common stockholders of IES Holdings, Inc.	$	43,797	$	26,577
Increase in noncontrolling interest		400		—
Net income attributable to restricted stockholders of IES Holdings, Inc.		38		416
Net income attributable to IES Holdings, Inc.	$	44,235	$	26,993
Denominator:
Weighted average common shares outstanding — basic		20,780,975		20,819,857
Effect of dilutive stock options and non-vested securities		285,514		264,410
Weighted average common and common equivalent shares outstanding — diluted		21,066,489		21,084,267
Earnings per share attributable to common stockholders of IES Holdings, Inc.:
Basic	$	2.11	$	1.28
Diluted	$	2.08	$	1.26