Quarterly Results Of Operations (Tables)

12 Months Ended

Sep. 30, 2016

Quarterly Results Of Operations (Unaudited) [Abstract]

Quarterly Financial Information [Table Text Block]

		Fiscal Year Ended September 30, 2016
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
Revenues		$	150,766	$	159,981	$	179,599	$	205,647
Gross profit		$	27,633	$	27,812	$	33,997	$	37,538
Net income attributable to IES Holdings, Inc.		$	5,799	$	2,194	$	10,805	$	101,980
Earnings per share:
	Basic	$	0.27	$	0.10	$	0.50	$	4.75
	Diluted	$	0.27	$	0.10	$	0.50	$	4.74

		Fiscal Year Ended September 30, 2015
		First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
Revenues		$	136,336	$	133,752	$	144,082	$	159,687
Gross profit		$	22,704	$	21,708	$	25,052	$	30,427
Net income from continuing operations		$	3,473	$	1,854	$	3,962	$	7,588
Net loss from discontinued operations		$	(181)	$	(44)	$	(5)	$	(109)
Net income		$	3,292	$	1,810	$	3,957	$	7,479
Earnings per share from continuing
	operations:
	Basic	$	0.16	$	0.08	$	0.19	$	0.36
	Diluted	$	0.16	$	0.08	$	0.19	$	0.36
Loss per share from discontinued
	operations:
	Basic	$	(0.01)	$	0.00	$	0.00	$	(0.01)
	Diluted	$	(0.01)	$	0.00	$	0.00	$	(0.01)
Earnings per share:
	Basic	$	0.15	$	0.08	$	0.19	$	0.35
	Diluted	$	0.15	$	0.08	$	0.19	$	0.35