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Leases - Narrative (Details) - USD ($)
 12 Months Ended
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Sep. 28, 2019
Lessee, Lease, Description [Line Items]        
Accrued expenses and other current liabilities $ 0      
Present value of lease liabilities 413,477,000      
Operating Lease Right-of-use Assets (see Note 8) $ 551,394,000 $ 0    
Weighted average remaining lease term 8 years 6 months      
Operating leases, rent expense $ 375,000,000.0      
Rental expense for all operating leases   $ 860,600,000 $ 187,500,000  
Accounting Standards Update 2016-02        
Lessee, Lease, Description [Line Items]        
Present value of lease liabilities       $ 416,100,000
Operating Lease Right-of-use Assets (see Note 8)       $ 558,500,000
Minimum        
Lessee, Lease, Description [Line Items]        
Primary vehicle lease, term 1 year      
Maximum        
Lessee, Lease, Description [Line Items]        
Primary vehicle lease, term 30 years      
Maximum potential liability from vehicle leases $ 28,500,000      
Residual value guarantee, value assumptions, terminal fair value of vehicles coming off lease $ 0      
Vehicles | Minimum        
Lessee, Lease, Description [Line Items]        
Primary vehicle lease, term 1 year      
Vehicles | Maximum        
Lessee, Lease, Description [Line Items]        
Primary vehicle lease, term 12 years