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Segment Information - Reconciliation of Operating Segment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 25, 2015
Sep. 26, 2014
Segment Reporting Information [Line Items]      
Unallocated expenses $ (28,137) $ (22,320) $ (19,617)
Depreciation and amortization (55,017) (59,465) (58,695)
Interest expense, net (41,798) (44,809) (44,266)
Gain on extinguishment of debt 1,661 0 (43,667)
Restructuring & impairments (4,096) (32,703) (46,687)
Net periodic pension benefit cost (441) (578) (1,368)
Stock-based compensation (21,127) (13,523) (8,398)
Legal settlements (1,382) 0 0
Consulting fees (15,425) (3,500) (4,854)
Transaction costs (7,832) (6,039) (5,049)
Other (1,103) (14,305) (12,656)
Impact of Fence and Sprinkler exit (811) 2,885 (5,003)
Income (loss) before income taxes 86,781 (7,871) (106,887)
Special Products Claims      
Segment Reporting Information [Line Items]      
ABF product liability impact (850) 216 (2,841)
Operating Segments      
Segment Reporting Information [Line Items]      
Operating segment Adjusted EBITDA 263,139 186,270 146,214
Operating Segments | Electrical Raceway      
Segment Reporting Information [Line Items]      
Operating segment Adjusted EBITDA 174,588 106,717 86,273
Operating Segments | Mechanical Products & Solutions      
Segment Reporting Information [Line Items]      
Operating segment Adjusted EBITDA $ 88,551 $ 79,553 $ 59,941