Operating Segments (Tables)

9 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

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

		Three Months Ended June 30, 2022
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	144,748	$	301,763	$	39,837	$	80,953	$	—	$	567,301
Cost of services		128,952		248,928		33,726		72,895		—		484,501
Gross profit		15,796		52,835		6,111		8,058		—		82,800
Selling, general and administrative		11,544		37,237		6,484		7,788		4,037		67,090
Contingent consideration		—		70		—		—		—		70
Loss (gain) on sale of assets		(1)		6		—		(2)		—		3
Operating income (loss)		$	4,253	$	15,522	$	(373)	$	272	$	(4,037)	$	15,637
Other data:
	Depreciation and amortization expense	$	394	$	3,863	$	1,427	$	645	$	43	$	6,372
	Capital expenditures	$	424	$	1,115	$	3,071	$	372	$	—	$	4,982
	Total assets	$	196,520	$	376,328	$	152,405	$	111,782	$	47,357	$	884,392

		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

		Nine Months Ended June 30, 2022
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	402,776	$	803,945	$	123,666	$	219,016	$	—	$	1,549,403
Cost of services		355,360		662,928		102,774		207,307		—		1,328,369
Gross profit		47,416		141,017		20,892		11,709		—		221,034
Selling, general and administrative		33,907		101,808		18,933		23,504		11,770		189,922
Contingent consideration		—		208		—		—		—		208
Loss (gain) on sale of assets		(14)		14		(28)		(42)		—		(70)
Operating income (loss)		$	13,523	$	38,987	$	1,987	$	(11,753)	$	(11,770)	$	30,974
Other data:
	Depreciation and amortization expense	$	1,115	$	11,436	$	4,155	$	1,922	$	114	$	18,742
	Capital expenditures	$	1,768	$	9,006	$	14,210	$	1,457	$	168	$	26,609
	Total assets	$	196,520	$	376,328	$	152,405	$	111,782	$	47,357	$	884,392

		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