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Commitments And Contingencies - Narrative (Details)
 12 Months Ended
Oct. 02, 2020
USD ($)
Sep. 27, 2019
USD ($)
Lawsuit
Sep. 28, 2018
USD ($)
Loss Contingencies [Line Items]      
Capital and other purchase commitments $ 816,100,000    
Letters of credit outstanding 191,700,000    
Amounts accrued for guarantee arrangements $ 0    
Litigation settlement expense   $ 21,000,000.0  
Minimum      
Loss Contingencies [Line Items]      
Primary vehicle lease, term 1 year    
Number of class action lawsuits | Lawsuit   2  
Maximum      
Loss Contingencies [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    
Accrued Payroll and Related Expenses      
Loss Contingencies [Line Items]      
Separation costs 145,800,000    
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
Employee Severance and Other Costs | Accrued Payroll and Related Expenses      
Loss Contingencies [Line Items]      
Separation costs 0    
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  
Loss Contingency, Accrual, Current $ 5,500,000    
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