Per Share Information (Tables)

6 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

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

	Three Months Ended March 31,
	2021		2020
Numerator:
Net income attributable to common stockholders of IES Holdings, Inc.	$	12,207	$	6,175
Increase (decrease) in noncontrolling interest		621		(45)
Net income attributable to restricted stockholders of IES Holdings, Inc.		8		101
Net income attributable to IES Holdings, Inc.	$	12,836	$	6,231
Denominator:
Weighted average common shares outstanding — basic		20,780,006		20,847,245
Effect of dilutive stock options and non-vested securities		291,053		275,065
Weighted average common and common equivalent shares outstanding — diluted		21,071,059		21,122,310
Earnings per share attributable to common stockholders of IES Holdings, Inc.:
Basic	$	0.59	$	0.30
Diluted	$	0.58	$	0.29

	Six Months Ended March 31,
	2021		2020
Numerator:
Net income attributable to common stockholders of IES Holdings, Inc.	$	24,411	$	14,510
Increase in noncontrolling interest		503		—
Net income attributable to restricted stockholders of IES Holdings, Inc.		20		223
Net income attributable to IES Holdings, Inc.	$	24,934	$	14,733
Denominator:
Weighted average common shares outstanding — basic		20,756,879		20,865,460
Effect of dilutive stock options and non-vested securities		302,209		267,059
Weighted average common and common equivalent shares outstanding — diluted		21,059,088		21,132,519
Earnings per share attributable to common stockholders of IES Holdings, Inc.:
Basic	$	1.18	$	0.70
Diluted	$	1.16	$	0.69