Goodwill and Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amounts of Goodwill

Changes in the carrying amount of goodwill are as follows:

	Segment
(in thousands)	Electrical Raceway			Mechanical Products & Solutions			Total
Balance as of September 26, 2014
Goodwill	$	75,253		$	82,189		$	157,442
Accumulated impairment losses	—			(43,000		)	(43,000		)
Total	75,253			39,189			114,442
Goodwill acquired during year	5,311			—			5,311
Impairment losses	(3,924		)	—			(3,924		)
Total	$	76,640		$	39,189		$	115,829
Balance as of September 25, 2015
Goodwill	$	80,564		$	82,189		$	162,753
Accumulated impairment losses	(3,924		)	(43,000		)	(46,924		)
Total	$	76,640		$	39,189		$	115,829
Balance at September 30, 2016
Goodwill	$	80,564		$	82,189		$	162,753
Accumulated impairment losses	(3,924		)	(43,000		)	(46,924		)
Total	$	76,640		$	39,189		$	115,829

Schedule of Major Classes of Finite-Lived Intangible Assets

The following table provides the gross carrying value, accumulated amortization, and net carrying value for each major class of intangible assets:

		September 30, 2016							September 25, 2015
($ in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Amortizable Intangible Assets:
Customer relationships	12	$	249,245	$	(97,484	)	$	151,761	$	249,245	$	(77,112	)	$	172,133
Other	7	16,943		(7,647		)	9,296		16,943		(5,781		)	11,162
Total		266,188		(105,131		)	161,057		266,188		(82,893		)	183,295
Indefinite-lived Intangible Assets:
Trade names		93,880		—			93,880		93,880		—			93,880
Total		$	360,068	$	(105,131	)	$	254,937	$	360,068	$	(82,893	)	$	277,175

Schedule of Major Classes of Indefinite-Lived Intangible Assets

The following table provides the gross carrying value, accumulated amortization, and net carrying value for each major class of intangible assets:

		September 30, 2016							September 25, 2015
($ in thousands)	Weighted Average Useful Life (Years)	Gross Carrying Value		Accumulated Amortization			Net Carrying Value		Gross Carrying Value		Accumulated Amortization			Net Carrying Value
Amortizable Intangible Assets:
Customer relationships	12	$	249,245	$	(97,484	)	$	151,761	$	249,245	$	(77,112	)	$	172,133
Other	7	16,943		(7,647		)	9,296		16,943		(5,781		)	11,162
Total		266,188		(105,131		)	161,057		266,188		(82,893		)	183,295
Indefinite-lived Intangible Assets:
Trade names		93,880		—			93,880		93,880		—			93,880
Total		$	360,068	$	(105,131	)	$	254,937	$	360,068	$	(82,893	)	$	277,175

Schedule of Expected Amortization Expense for Intangible Assets

Expected amortization expense for intangible assets over the next five years and thereafter is as follows:

2017	21,817
2018	21,399
2019	21,235
2020	21,256
2021	20,558
Thereafter	54,792