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Borrowings and Credit Arrangements - Interest Expense Senior Notes (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Sep. 28, 2020
Line of Credit Facility [Line Items]      
Interest expense $ 15.1 $ 15.7  
Senior Notes | 2028 Senior Notes      
Line of Credit Facility [Line Items]      
Stated interest rate 4.625%    
Interest expense $ 4.8 4.8  
Senior Notes | 2025 Senior Notes      
Line of Credit Facility [Line Items]      
Stated interest rate 4.375%    
Interest expense $ 2.3 10.9  
Senior Notes | 2029 Senior Notes      
Line of Credit Facility [Line Items]      
Stated interest rate 3.25%   3.25%
Interest expense $ 8.0 $ 0.0