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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - Senior Notes - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Sep. 28, 2020
Jan. 19, 2018
Debt Instrument [Line Items]          
Interest expense $ 53.0 $ 52.1 $ 54.2    
Non-cash interest expense 2.8 2.8 2.9    
2028 Senior Notes          
Debt Instrument [Line Items]          
Interest expense 19.5 19.2 19.2    
Non-cash interest expense $ 0.7 0.7 0.7    
Interest rate (percent) 4.625%       4.625%
2025 Senior Notes          
Debt Instrument [Line Items]          
Interest expense $ 0.0 0.0 2.3    
Non-cash interest expense $ 0.0 0.0 0.1    
Interest rate (percent) 4.375%        
2029 Senior Notes          
Debt Instrument [Line Items]          
Interest expense $ 33.5 32.9 32.7    
Non-cash interest expense $ 2.1 $ 2.1 $ 2.1    
Interest rate (percent) 3.25%     3.25%