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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 29, 2019
Sep. 30, 2018
Amortizable intangible assets:    
Gross Carrying Value $ 358,606 $ 346,298
Accumulated Amortization (163,685) (147,262)
Net Carrying Value 194,921 199,036
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Value 451,486 439,178
Net Carrying Value 287,801 291,916
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 340,520 330,295
Accumulated Amortization (156,884) (141,401)
Net Carrying Value $ 183,636 188,894
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 (6,801) (5,861)
Net Carrying Value $ 11,285 $ 10,142
Other | Weighted Average Useful Life (Years)    
Amortizable intangible assets:    
Weighted Average Useful Life (Years) 8 years