Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	Communications		Residential		Infrastructure Solutions		Commercial & Industrial		Total
Balance at September 30, 2018	$	2,816	$	9,979	$	30,931	$	6,976	$	50,702
Divestitures	—		—		(119)		—		(119)
Purchase accounting adjustments	—		39		—		—		39
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

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

				September 30, 2019
	Estimated Useful Lives (in Years)			Gross Carrying Amount		Accumulated Amortization		Net
Trademarks/trade names	5	-	20	$	5,084	$	(1,267)	$	3,817
Technical library	20			400		(121)		279
Customer relationships	6	-	15	33,539		(11,051)		22,488
Non-competition arrangements	5			40		(9)		31
Backlog and construction contracts	1			599		(591)		8
Total				$	39,662	$	(13,039)	$	26,623

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

Year Ending September 30,
2021	$	6,217
2022	4,634
2023	4,241
2024	3,898
2025	3,571
Thereafter	16,796
Total	$	39,357