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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($)
$ in Millions
Mar. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Current portion of long-term debt $ 37.4 $ 287.0
Total long-term debt obligations 2,514.1 2,531.2
Total debt obligations 2,551.5 2,818.2
Term Loan    
Debt Instrument [Line Items]    
Current portion of long-term debt 37.4 287.0
Long term debt obligations. excluding convertible notes 1,177.1 1,195.6
2028 Senior Notes    
Debt Instrument [Line Items]    
Long term debt obligations. excluding convertible notes 397.2 396.8
2029 Senior Notes    
Debt Instrument [Line Items]    
Long term debt obligations. excluding convertible notes $ 939.8 $ 938.8