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Segment Information - Reconciliation of Operating Segment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 27, 2020
Mar. 29, 2019
Mar. 27, 2020
Mar. 29, 2019
Segment Reporting Information [Line Items]        
Operating segment Adjusted EBITDA $ 95,098 $ 84,796 $ 181,973 $ 164,172
Unallocated expenses (8,092) (7,702) (17,257) (17,055)
Depreciation and amortization (18,478) (18,280) (37,208) (36,301)
Interest expense, net (10,564) (13,328) (21,184) (25,488)
Restructuring charges (2,645) (1,085) (2,865) (2,472)
Stock-based compensation (4,523) (1,834) (7,646) (4,816)
Transaction costs (6) (123) (57) (287)
Other 1,503 (2,636) (1,333) (2,842)
Income before income taxes 52,293 39,808 94,423 74,911
Operating Segments | Electrical Raceway        
Segment Reporting Information [Line Items]        
Operating segment Adjusted EBITDA 78,954 67,375 149,175 135,864
Operating Segments | MP&S        
Segment Reporting Information [Line Items]        
Operating segment Adjusted EBITDA $ 16,144 $ 17,421 $ 32,798 $ 28,308