Operating Segments (Tables)

9 Months Ended

Jun. 30, 2021

Segment Reporting [Abstract]

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

		Three Months Ended June 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	116,218	$	186,449	$	39,117	$	64,087	$	—	$	405,871
Cost of services		95,582		152,778		28,374		56,308		—		333,042
Gross profit		20,636		33,671		10,743		7,779		—		72,829
Selling, general and administrative		10,783		22,634		5,961		6,781		4,183		50,342
Contingent consideration		—		69		—		—		—		69
Loss (gain) on sale of assets		(7)		8		(1)		(32)		—		(32)
Operating income (loss)		$	9,860	$	10,960	$	4,783	$	1,030	$	(4,183)	$	22,450
Other data:
	Depreciation and amortization expense	$	341	$	3,456	$	1,553	$	673	$	39	$	6,062
	Capital expenditures	$	187	$	641	$	1,034	$	525	$	—	$	2,387
	Total assets	$	141,004	$	308,411	$	136,741	$	76,278	$	53,496	$	715,930

		Three Months Ended June 30, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	96,500	$	107,905	$	31,942	$	56,778	$	—	$	293,125
Cost of services		77,792		82,192		22,609		52,212		—		234,805
Gross profit		18,708		25,713		9,333		4,566		—		58,320
Selling, general and administrative		9,316		16,767		5,512		8,786		3,880		44,261
Loss (gain) on sale of assets		—		—		3		(6)		—		(3)
Operating income (loss)		$	9,392	$	8,946	$	3,818	$	(4,214)	$	(3,880)	$	14,062
Other data:
	Depreciation and amortization expense	$	330	$	476	$	1,683	$	692	$	19	$	3,200
	Capital expenditures	$	63	$	108	$	135	$	496	$	—	$	802
	Total assets	$	131,796	$	107,919	$	126,557	$	71,877	$	87,176	$	525,325

		Nine Months Ended June 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	309,460	$	456,276	$	108,234	$	178,700	$	—	$	1,052,670
Cost of services		250,738		368,887		76,999		159,664		—		856,288
Gross profit		58,722		87,389		31,235		19,036		—		196,382
Selling, general and administrative		29,739		61,570		17,787		19,949		11,738		140,783
Contingent consideration		—		142		—		—		—		142
Loss (gain) on sale of assets		(7)		60		(1)		(49)		(27)		(24)
Operating income (loss)		$	28,990	$	25,617	$	13,449	$	(864)	$	(11,711)	$	55,481
Other data:
	Depreciation and amortization expense	$	1,035	$	8,165	$	4,548	$	2,050	$	112	$	15,910
	Capital expenditures	$	452	$	2,118	$	1,542	$	1,190	$	89	$	5,391
	Total assets	$	141,004	$	308,411	$	136,741	$	76,278	$	53,496	$	715,930

		Nine Months Ended June 30, 2020
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	276,779	$	300,660	$	92,525	$	190,481	$	—	$	860,445
Cost of services		225,866		231,891		68,177		174,712		—		700,646
Gross profit		50,913		68,769		24,348		15,769		—		159,799
Selling, general and administrative		27,304		46,241		14,923		24,660		11,041		124,169
Loss (gain) on sale of assets		(9)		—		3		(34)		—		(40)
Operating income (loss)		$	23,618	$	22,528	$	9,422	$	(8,857)	$	(11,041)	$	35,670
Other data:
	Depreciation and amortization expense	$	1,010	$	1,117	$	4,557	$	2,057	$	56	$	8,797
	Capital expenditures	$	531	$	977	$	725	$	1,168	$	299	$	3,700
	Total assets	$	131,796	$	107,919	$	126,557	$	71,877	$	87,176	$	525,325