Goodwill and Intangible Assets (Tables)

9 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	Commercial & Industrial		Communications		Infrastructure Solutions		Residential		Total
Goodwill at September 30, 2019	$	6,976	$	2,816	$	30,812	$	10,018	$	50,622
Acquisitions		—		—		3,916		5,946		9,862
Divestitures		—		—		—		—		—
Adjustments		—		—		—				—
Goodwill at June 30, 2020	$	6,976	$	2,816	$	34,728	$	15,964	$	60,484

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

	Estimated Useful Lives (in Years)	June 30, 2020
			Gross Carrying Amount		Accumulated Amortization	Net
Trademarks/trade names	5-20	$	7,754	$	(1,593)	$	6,161
Technical library	20		400		(136)		264
Customer relationships	6-15		46,269		(13,797)		32,472
Non-competition arrangements	5		1,300		(59)		1,241
Backlog and construction contracts	1		3,063		(1,009)		2,054
Total intangible assets		$	58,786	$	(16,594)	$	42,192

	Estimated Useful Lives (in Years)	September 30, 2019
			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 intangible assets		$	39,662	$	(13,039)	$	26,623