Operating Segments (Tables)

3 Months Ended

Dec. 31, 2021

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Three Months Ended December 31, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	127,389	$	241,776	$	42,096	$	69,248	$	—	$	480,509
Cost of services		106,891		199,138		34,375		60,378		—		400,782
Gross profit		20,498		42,638		7,721		8,870		—		79,727
Selling, general and administrative		11,384		30,995		6,059		7,268		3,696		59,402
Contingent consideration		—		69		—		—		—		69
Loss (gain) on sale of assets		(6)		8		—		(7)		—		(5)
Operating income (loss)		$	9,120	$	11,566	$	1,662	$	1,609	$	(3,696)	$	20,261
Other data:
	Depreciation and amortization expense	$	359	$	3,852	$	1,343	$	630	$	30	$	6,214
	Capital expenditures	$	594	$	1,184	$	10,316	$	245	$	—	$	12,339
	Total assets	$	161,419	$	338,824	$	145,722	$	94,157	$	45,106	$	785,228

		Three Months Ended December 31, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	98,356	$	119,491	$	34,401	$	62,590	$	—	$	314,838
Cost of services		79,817		95,963		23,464		56,915		—		256,159
Gross profit		18,539		23,528		10,937		5,675		—		58,679
Selling, general and administrative		9,341		17,327		5,611		6,424		4,083		42,786
Loss (gain) on sale of assets		—		—		(1)		(9)		—		(10)
Operating income (loss)		$	9,198	$	6,201	$	5,327	$	(740)	$	(4,083)	$	15,903
Other data:
	Depreciation and amortization expense	$	347	$	1,504	$	1,441	$	694	$	34	$	4,020
	Capital expenditures	$	132	$	437	$	345	$	268	$	—	$	1,182
	Total assets	$	137,457	$	198,227	$	129,283	$	72,148	$	72,255	$	609,370