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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 27, 2020
Sep. 30, 2019
Amortizable intangible assets:    
Gross Carrying Value $ 372,728 $ 372,342
Accumulated Amortization (195,726) (179,538)
Net Carrying Value 177,002 192,804
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Value 465,608 465,222
Net Carrying Value 269,882 285,684
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 353,642 353,256
Accumulated Amortization (186,994) (171,777)
Net Carrying Value $ 166,648 181,479
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 (8,732) (7,761)
Net Carrying Value $ 10,354 $ 11,325
Other | Weighted Average Useful Life (Years)    
Amortizable intangible assets:    
Weighted Average Useful Life (Years) 7 years