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Commitments And Contingencies - Narrative (Details) | 12 Months Ended
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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 |

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