Revenue Recognition (Tables)

3 Months Ended

Dec. 31, 2020

Revenue Recognition and Deferred Revenue [Abstract]

Disaggregation of Revenue [Table Text Block]

	Three Months Ended December 31,
	2020		2019
Communications	$	98,356	$	84,289
Residential
Single-family	72,126		54,874
Multi-family and Other	47,365		37,854
Total Residential	119,491		92,728
Infrastructure Solutions
Industrial Services	10,040		11,111
Custom Power Solutions	24,361		20,172
Total Infrastructure Solutions	34,401		31,283
Commercial & Industrial	$	62,590	$	67,743
Total Revenue	$	314,838	$	276,043

	Three Months Ended December 31, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	76,014	$	119,491	$	32,664	$	60,687	$	288,856
Time-and-material			22,342		—		1,737		1,903		25,982
Total revenue		$	98,356	$	119,491	$	34,401	$	62,590	$	314,838
	Three Months Ended December 31, 2019
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Fixed-price		$	62,027	$	92,728	$	29,491	$	63,835	$	248,081
Time-and-material			22,262		—		1,792		3,908		27,962
Total revenue		$	84,289	$	92,728	$	31,283	$	67,743	$	276,043