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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($)
$ in Millions
Dec. 26, 2020
Sep. 26, 2020
Mar. 31, 2020
Debt Instrument [Line Items]      
Current portion of long-term debt $ 74.9 $ 324.9  
Total long-term debt obligations 2,689.5 2,713.9  
Total debt obligations 2,764.4 3,038.8  
Term Loan      
Debt Instrument [Line Items]      
Current portion of long-term debt 74.9 74.9  
Long term debt obligations. excluding convertible notes 1,361.8 1,379.9  
Revolver      
Debt Instrument [Line Items]      
Current portion of long-term debt 0.0 250.0 $ 750.0
2025 Senior Notes      
Debt Instrument [Line Items]      
Long term debt obligations. excluding convertible notes 0.0 939.4  
2028 Senior Notes      
Debt Instrument [Line Items]      
Long term debt obligations. excluding convertible notes 394.8 394.6  
2029 Senior Notes      
Debt Instrument [Line Items]      
Long term debt obligations. excluding convertible notes $ 932.9 $ 0.0