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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 27, 2019
Sep. 30, 2019
Amortizable intangible assets:    
Gross Carrying Value $ 375,078 $ 372,342
Accumulated Amortization (188,210) (179,538)
Net Carrying Value 186,868 192,804
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Value 467,958 465,222
Net Carrying Value 279,748 285,684
Trade names    
Indefinite-lived Intangible Assets [Line Items]    
Gross carrying value/net carrying value 92,880 92,880
Customer relationships    
Amortizable intangible assets:    
Gross Carrying Value 355,992 353,256
Accumulated Amortization (179,950) (171,777)
Net Carrying Value $ 176,042 181,479
Customer relationships | Weighted Average Useful Life (Years)    
Amortizable intangible assets:    
Weighted Average Useful Life (Years) 11 years  
Other    
Amortizable intangible assets:    
Gross Carrying Value $ 19,086 19,086
Accumulated Amortization (8,260) (7,761)
Net Carrying Value $ 10,826 $ 11,325
Other | Weighted Average Useful Life (Years)    
Amortizable intangible assets:    
Weighted Average Useful Life (Years) 7 years