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Restructuring Charges (Tables)
12 Months Ended
Sep. 30, 2023
Restructuring and Related Activities [Abstract]  
Charges Taken Related to Restructuring Actions The following table displays charges taken related to restructuring actions in fiscal 2023, 2022 and 2021 and a rollforward of the charges to the accrued balances as of September 30, 2023:
Fiscal 2023 Actions
Fiscal 2022 Actions
Fiscal 2021 Actions
OtherTotal    
Restructuring Charges
Fiscal 2021 charges:
Workforce reductions$— $— $8.7 $0.6 $9.3 
Fiscal 2021 restructuring charges
$— $— $8.7 $0.6 $9.3 
Fiscal 2022 charges:
Workforce reductions$— $2.6 $(0.3)$(0.4)$1.9 
Facility closure costs
— 0.5 — — 0.5 
Fiscal 2022 restructuring charges
$— $3.1 $(0.3)$(0.4)$2.4 
Fiscal 2023 charges:
Workforce reductions$5.5 $6.0 $— $— $11.5 
Other costs
— 0.5 — — 0.5 
Fiscal 2023 restructuring charges
$5.5 $6.5 $— $— $12.0 
Charges Taken Related to Accrued Restructuring Actions
Fiscal 2023 Actions
Fiscal 2022 Actions
Fiscal 2021 Actions
Previous Other ChargesTotal    
Rollforward of Accrued Restructuring  
Balance as of September 26, 2020
$— $— $— $4.5 $4.5 
Fiscal 2021 restructuring charges
$— $— $8.7 $0.6 $9.3 
Stock-based compensation— — (0.9)— (0.9)
Severance payments and adjustments— — (4.6)(4.2)(8.8)
Balance as of September 25, 2021
$— $— $3.2 $0.9 $4.1 
Fiscal 2022 restructuring charges
$— $3.1 $(0.3)$(0.4)$2.4 
Severance payments and adjustments— (0.4)(2.5)(0.5)(3.4)
Balance as of September 24, 2022
$— $2.7 $0.4 $— $3.1 
Fiscal 2023 restructuring charges
$5.5 $6.5 $— $— $12.0 
Severance payments and adjustments(3.2)(2.5)(0.4)— (6.1)
Balance as of September 30, 2023
$2.3 $6.7 $— $— $9.0