Quarterly Results of Operations (Tables)

12 Months Ended

Sep. 30, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Table Text Block]

Quarterly financial information for the years ended September 30, 2020 and 2019 is summarized as follows:

	Year Ended September 30, 2020
	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter
Revenues	$	276,043	$	291,277	$	293,125	$	330,411
Gross profit	$	50,215	$	51,264	$	58,320	$	68,160
Net income (loss) attributable to IES Holdings, Inc.	$	8,502	$	6,231	$	12,260	$	14,606
Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic	$	0.40	$	0.30	$	0.58	$	0.69
Diluted	$	0.39	$	0.29	$	0.58	$	0.68

	Year Ended September 30, 2019
	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter
Revenues	$	243,842	$	256,914	$	282,633	$	293,607
Gross profit	$	41,601	$	43,235	$	46,397	$	50,870
Net income (loss) attributable to IES Holdings, Inc.	$	6,884	$	5,489	$	10,972	$	9,861
Earnings (loss) per share attributable to IES Holdings, Inc.:
Basic	$	0.32	$	0.26	$	0.52	$	0.47
Diluted	$	0.32	$	0.26	$	0.52	$	0.46