Goodwill and Intangible Assets (Tables)

9 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	Communications		Residential		Infrastructure Solutions		Total
Goodwill at September 30, 2020	$	2,816	$	16,219	$	34,728	$	53,763
Acquisitions		—		34,902		3,362		38,264
Goodwill at June 30, 2021	$	2,816	$	51,121	$	38,090	$	92,027

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Estimated Useful Lives (in Years)			June 30, 2021
					Gross Carrying Amount		Accumulated Amortization	Net
Trademarks/trade names	5	-	20	$	15,394	$	(2,591)	$	12,803
Technical library	20				400		(156)		244
Customer relationships	6	-	15		96,879		(21,057)		75,822
Non-competition arrangements	5				40		(23)		17
Backlog and construction contracts	1				4,957		(4,542)		415
Total intangible assets				$	117,670	$	(28,369)	$	89,301

	Estimated Useful Lives (in Years)			September 30, 2020
					Gross Carrying Amount		Accumulated Amortization	Net
Trademarks/trade names	5	-	20	$	7,754	$	(1,741)	$	6,013
Technical library	20				400		(141)		259
Customer relationships	6	-	15		46,449		(14,900)		31,549
Non-competition arrangements	5				40		(17)		23
Backlog and construction contracts	1				3,383		(1,870)		1,513
Total intangible assets				$	58,026	$	(18,669)	$	39,357