Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Balance at September 30, 2019	$	2,816	$	10,018	$	30,812	$	6,976	$	50,622
Acquisitions (Note 19)	—		6,201		3,916		—		10,117
Goodwill impairment	—		—		—		(6,976)		(6,976)
Balance at September 30, 2020	2,816		16,219		34,728		—		53,763
Acquisitions (Note 19)	—		35,151		3,481		—		38,632
Balance at September 30, 2021	$	2,816	$	51,370	$	38,209	$	—	$	92,395

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

				September 30, 2020
	Estimated Useful Lives (in Years)			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				$	58,026	$	(18,669)	$	39,357

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year Ending September 30,
2022	$	13,683
2023	13,153
2024	12,810
2025	12,370
2026	12,030
Thereafter	21,573
Total	$	85,619