Operating Segments (Tables)

12 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

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

		Year Ended September 30, 2023
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	600,776	$	1,279,504	$	217,353	$	279,594	$	—	$	2,377,227
Cost of services		494,964		1,026,524		162,905		248,295		—		1,932,688
Gross profit		105,812		252,980		54,448		31,299		—		444,539
Selling, general and administrative		54,344		169,737		26,260		25,225		23,059		298,625
Contingent consideration		—		277		—		—		—		277
Loss (gain) on sale of assets		12		69		(1,029)		(13,198)		7		(14,139)
Income (loss) from operations		$	51,456	$	82,897	$	29,217	$	19,272	$	(23,066)	$	159,776
Other data:
	Depreciation and amortization expense	$	2,215	$	19,281	$	5,198	$	1,640	$	1,073	$	29,407
	Capital expenditures	$	2,203	$	9,114	$	2,767	$	2,525	$	1,058	$	17,667
	Total assets	$	205,924	$	386,829	$	180,871	$	87,677	$	120,299	$	981,600

		Year Ended September 30, 2022
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	559,777	$	1,131,414	$	167,113	$	308,504	$	—	$	2,166,808
Cost of services		490,959		928,161		138,444		290,314		—		1,847,878
Gross profit		68,818		203,253		28,669		18,190		—		318,930
Selling, general and administrative		46,717		144,100		25,129		30,557		16,211		262,714
Contingent consideration		—		277		—		—		—		277
Loss (gain) on sale of assets		12		20		(46)		(55)		—		(69)
Income (loss) from operations		$	22,089	$	58,856	$	3,586	$	(12,312)	$	(16,211)	$	56,008
Other data:
	Depreciation and amortization expense	$	1,550	$	15,617	$	5,575	$	2,561	$	165	$	25,468
	Capital expenditures	$	2,004	$	10,054	$	14,729	$	1,890	$	578	$	29,255
	Total assets	$	210,875	$	394,757	$	161,828	$	114,529	$	52,720	$	934,709

		Year Ended September 30, 2021
		Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Corporate		Total
Revenues		$	445,968	$	687,347	$	146,980	$	256,198	$	—	$	1,536,493
Cost of services		361,197		553,546		106,048		227,704		—		1,248,495
Gross profit		84,771		133,801		40,932		28,494		—		287,998
Selling, general and administrative		41,373		92,761		23,966		28,172		15,979		202,251
Contingent consideration		—		211		—		—		—		211
Loss (gain) on sale of assets		(4)		86		(10)		(92)		(27)		(47)
Income (loss) from operations		$	43,402	$	40,743	$	16,976	$	414	$	(15,952)	$	85,583
Other data:
	Depreciation and amortization expense	$	1,394	$	11,490	$	6,170	$	2,709	$	151	$	21,914
	Capital expenditures	$	963	$	2,829	$	2,067	$	1,453	$	89	$	7,401
	Total assets	$	164,699	$	329,691	$	137,628	$	87,577	$	47,027	$	766,622