Revenue Recognition (Tables)

3 Months Ended

Dec. 31, 2019

Revenue Recognition and Deferred Revenue [Abstract]

Disaggregation of Revenue [Table Text Block]

	Three Months Ended December 31,
	2019		2018
Commercial & Industrial	$	67,743	$	72,583
Communications	84,289		69,325
Infrastructure Solutions
Industrial Services	11,111		12,223
Custom Power Solutions	20,172		17,256
Total	31,283		29,479
Residential
Single-family	54,874		50,476
Multi-family and Other	37,854		21,979
Total	92,728		72,455
Total Revenue	$	276,043	$	243,842

	Three Months Ended December 31, 2019
		Commercial & Industrial		Communications		Infrastructure Solutions		Residential		Total
Fixed-price		$	63,835	$	62,027	$	29,491	$	92,728	$	248,081
Time-and-material			3,908		22,262		1,792		—		27,962
Total revenue		$	67,743	$	84,289	$	31,283	$	92,728	$	276,043
	Three Months Ended December 31, 2018
		Commercial & Industrial		Communications		Infrastructure Solutions		Residential		Total
Fixed-price		$	65,830	$	48,829	$	27,511	$	72,455	$	214,625
Time-and-material			6,753		20,496		1,968		—		29,217
Total revenue		$	72,583	$	69,325	$	29,479	$	72,455	$	243,842

Contract with Customer, Asset and Liability [Table Text Block]

The net asset (liability) position for contracts in process consisted of the following:

	December 31,			September 30,
	2019			2019
Costs and estimated earnings on uncompleted contracts	$	750,341		$	761,401
Less: Billings to date and unbilled accounts receivable		(767,955	)		(772,104	)
	$	(17,614	)	$	(10,703	)

The net asset (liability) position for contracts in process included in the accompanying consolidated balance sheets was as follows:

	December 31,			September 30,
	2019			2019
Costs and estimated earnings in excess of billings	$	27,941		$	29,860
Billings in excess of costs and estimated earnings		(45,555	)		(40,563	)
	$	(17,614	)	$	(10,703	)