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Commitments And Contingencies - Narrative (Details)
 12 Months Ended
Aug. 26, 2019
USD ($)
Sep. 27, 2019
USD ($)
Lawsuit
Sep. 28, 2018
USD ($)
Sep. 29, 2017
USD ($)
Loss Contingencies [Line Items]        
Capital and other purchase commitments   $ 595,300,000    
Letters of credit outstanding   110,100,000    
Maximum potential liability from vehicle leases   27,500,000    
Residual value guarantee, value assumptions, terminal fair value of vehicles coming off lease   0    
Amounts accrued for guarantee arrangements   0    
Rental expense for all operating leases   $ 860,600,000 $ 187,500,000 $ 170,000,000.0
Number of class action lawsuits | Lawsuit   2    
Litigation settlement expense   $ 21,000,000.0    
Minimum        
Loss Contingencies [Line Items]        
Primary vehicle lease, term   1 year    
Maximum        
Loss Contingencies [Line Items]        
Primary vehicle lease, term   8 years    
Accrued Expenses and Other Current Liabilities        
Loss Contingencies [Line Items]        
Accrued estimate of possible loss   $ 21,000,000.0    
Employee Severance and Other Costs        
Loss Contingencies [Line Items]        
Separation costs   18,700,000 $ 36,600,000 $ 18,400,000
Employee Severance and Other Costs | Accrued Payroll and Related Expenses | Chairman, President and Chief Executive Officer        
Loss Contingencies [Line Items]        
Separation costs $ 10,400,000      
Cost of services provided        
Loss Contingencies [Line Items]        
Litigation settlement expense   12,000,000.0    
Selling, General Expenses        
Loss Contingencies [Line Items]        
Litigation settlement expense   $ 9,000,000.0