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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 28, 2018
Sep. 30, 2018
Amortizable intangible assets:    
Gross Carrying Value $ 357,667 $ 346,298
Accumulated Amortization (155,344) (147,262)
Net Carrying Value 202,323 199,036
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Value 450,547 439,178
Net Carrying Value 295,203 291,916
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 339,581 330,295
Accumulated Amortization (148,773) (141,401)
Net Carrying Value $ 190,808 188,894
Customer relationships | Weighted Average Useful Life (Years)    
Amortizable intangible assets:    
Weighted Average Useful Life (Years) 10 years  
Other    
Amortizable intangible assets:    
Gross Carrying Value $ 18,086 16,003
Accumulated Amortization (6,571) (5,861)
Net Carrying Value $ 11,515 $ 10,142
Other | Weighted Average Useful Life (Years)    
Amortizable intangible assets:    
Weighted Average Useful Life (Years) 8 years