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Segment Information - Reconciliation of Operating Segment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Segment Reporting Information [Line Items]    
Operating segment Adjusted EBITDA $ 86,847 $ 79,376
Unallocated expenses (9,137) (9,353)
Depreciation and amortization (18,730) (18,021)
Interest expense, net (10,620) (12,160)
Restructuring charges (220) (1,387)
Stock-based compensation (3,123) (2,982)
Transaction costs (51) (164)
Other (2,836) (206)
Income before income taxes 42,130 35,103
Operating Segments | Electrical Raceway    
Segment Reporting Information [Line Items]    
Operating segment Adjusted EBITDA 70,193 68,489
Operating Segments | MP&S    
Segment Reporting Information [Line Items]    
Operating segment Adjusted EBITDA $ 16,654 $ 10,887