Operating Segments (Tables)

9 Months Ended

Jun. 30, 2019

Segment Reporting [Abstract]

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

		Three Months Ended June 30, 2019
		Commercial & Industrial			Communications		Infrastructure Solutions			Residential		Corporate			Total
Revenues		$	75,370		$	90,438	$	36,109		$	80,716	$	—		$	282,633
Cost of services		69,171			75,044		27,671			64,350		—			236,236
Gross profit		6,199			15,394		8,438			16,366		—			46,397
Selling, general and administrative		6,827			8,406		4,937			11,812		4,351			36,333
Contingent consideration		—			—		(163		)	—		—			(163		)
Loss (gain) on sale of assets		(4		)	—		(4		)	—		—			(8		)
Operating income (loss)		(624		)	6,988		3,668			4,554		(4,351		)	10,235
Other data:
	Depreciation and amortization expense	$	652		$	339	$	1,122		$	218	$	23		$	2,354
	Capital expenditures	$	507		$	74	$	311		$	329	$	22		$	1,243
	Total assets	$	81,693		$	111,270	$	118,143		$	57,866	$	69,392		$	438,364

		Three Months Ended June 30, 2018
		Commercial & Industrial			Communications		Infrastructure Solutions		Residential		Corporate			Total
Revenues		$	78,156		$	54,368	$	24,856	$	75,196	$	—		$	232,576
Cost of services		67,839			43,436		18,701		60,063		—			190,039
Gross profit		10,317			10,932		6,155		15,133		—			42,537
Selling, general and administrative		6,980			7,193		4,568		10,941		2,690			32,372
Contingent consideration		—			—		81		—		—			81
Loss (gain) on sale of assets		(6		)	—		1		—		—			(5		)
Operating income (loss)		3,343			3,739		1,505		4,192		(2,690		)	10,089
Other data:
	Depreciation and amortization expense	$	548		$	595	$	1,120	$	156	$	18		$	2,437
	Capital expenditures	$	715		$	119	$	112	$	110	$	—		$	1,056
	Total assets	$	86,012		$	67,270	$	102,233	$	52,500	$	87,948		$	395,963

		Nine Months Ended June 30, 2019
			Commercial & Industrial			Communications		Infrastructure Solutions			Residential			Corporate			Total
Revenues			$	227,928		$	230,200	$	100,038		$	225,223		$	—		$	783,389
Cost of services			204,263			190,895		78,227			178,771			—			652,156
Gross profit			23,665			39,305		21,811			46,452			—			131,233
Selling, general and administrative			20,906			23,006		14,103			34,136			11,338			103,489
Contingent consideration			—			—		(278		)	—			—			(278		)
Loss (gain) on sale of assets			(8		)	—		97			(2		)	—			87
Operating income (loss)			2,767			16,299		7,889			12,318			(11,338		)	27,935
Other data:
	Depreciation and amortization expense		$	1,907		$	1,180	$	3,391		$	644		$	78		$	7,200
	Capital expenditures		$	1,974		$	767	$	1,133		$	1,174		$	124		$	5,172
	Total assets		$	81,693		$	111,270	$	118,143		$	57,866		$	69,392		$	438,364

		Nine Months Ended June 30, 2018
			Commercial & Industrial			Communications			Infrastructure Solutions		Residential			Corporate			Total
Revenues			$	196,747		$	159,071		$	70,407	$	210,328		$	—		$	636,553
Cost of services			175,066			129,667			54,543		167,836			—			527,112
Gross profit			21,681			29,404			15,864		42,492			—			109,441
Selling, general and administrative			19,624			19,478			13,762		30,995			8,249			92,108
Contingent consideration			—			—			152		—			—			152
Loss (gain) on sale of assets			(35		)	(9		)	6		(1		)	—			(39		)
Operating income (loss)			2,092			9,935			1,944		11,498			(8,249		)	17,220
Other data:
	Depreciation and amortization expense		$	1,632		$	1,030		$	3,503	$	452		$	89		$	6,706
	Capital expenditures		$	1,638		$	592		$	457	$	696		$	—		$	3,383
	Total assets		$	86,012		$	67,270		$	102,233	$	52,500		$	87,948		$	395,963