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Severance - Unpaid Obligations for Severance and Related Costs (Details) - Accrued Payroll and Related Expenses
$ in Millions
12 Months Ended
Sep. 29, 2023
USD ($)
Restructuring Reserve [Roll Forward]  
Severance and Related Costs Accrual Beginning Balance $ 16.8
Charges (Reversals) 40.4
Payments and Other (35.1)
Severance and Related Costs Accrual Ending Balance 22.1
Employee Severance and Other Costs | Fiscal 2022 Severance  
Restructuring Reserve [Roll Forward]  
Severance and Related Costs Accrual Beginning Balance 16.8
Charges (Reversals) (1.3)
Payments and Other (14.7)
Severance and Related Costs Accrual Ending Balance 0.8
Employee Severance and Other Costs | Fiscal 2023 Severance  
Restructuring Reserve [Roll Forward]  
Severance and Related Costs Accrual Beginning Balance 0.0
Charges (Reversals) 41.7
Payments and Other (20.4)
Severance and Related Costs Accrual Ending Balance $ 21.3