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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Oct. 15, 2020
Sep. 28, 2020
Mar. 27, 2021
Dec. 26, 2020
Mar. 28, 2020
Mar. 27, 2021
Mar. 28, 2020
Sep. 26, 2020
Mar. 31, 2020
Dec. 17, 2018
Debt Instrument [Line Items]                    
Long-term debt     $ 2,747,000,000.0     $ 2,747,000,000.0   $ 3,038,800,000    
Debt extinguishment losses     0   $ 0 21,600,000 $ 0      
Long-term Debt, Current Maturities     74,900,000     $ 74,900,000   324,900,000    
Debt Instrument, Redemption Price, Percentage   40.00%                
Amended Term Loan | Percentage Added to Eurodollar Rate                    
Debt Instrument [Line Items]                    
Basis spread on variable rate           1.00%        
Revolver                    
Debt Instrument [Line Items]                    
Long-term Debt, Current Maturities     0     $ 0   250,000,000.0 $ 750,000,000.0  
Debt Instrument, Unused Borrowing Capacity, Amount     1,500,000,000     $ 1,500,000,000        
Revolving credit facility borrowings                   $ 1,500,000,000
Senior Notes | 2025 Senior Notes                    
Debt Instrument [Line Items]                    
Debt extinguishment losses     $ (21,600,000)              
Stated interest rate     4.375%     4.375%        
Senior notes, face amount $ 950,000,000.0   $ 950,000,000.0     $ 950,000,000.0        
Interest Expense, Debt     5,800,000              
Debt Issuance Costs, Net     7,900,000     7,900,000        
Debt Instrument, Unamortized Discount     $ 6,400,000     $ 6,400,000        
Premium payment 20,800,000                  
Extinguishment of Debt, Amount $ 970,800,000                  
Senior Notes | 2028 Senior Notes                    
Debt Instrument [Line Items]                    
Stated interest rate     4.625%     4.625%        
Senior Notes | 2029 Senior Notes                    
Debt Instrument [Line Items]                    
Stated interest rate   3.25% 3.25%     3.25%        
Senior notes   $ 950,000,000 $ 950,000,000     $ 950,000,000        
Debt Instrument, Offering Price, Percent Of Face Value   1                
Debt Instrument, Redemption Price, Percentage   100.00%                
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period One                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage   103.25%                
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Two                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage   101.625%                
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Three                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage   100.813%                
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Four                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage   100.00%                
Senior Notes | 2029 Senior Notes | Debt Instrument, Redemption, Period Five                    
Debt Instrument [Line Items]                    
Debt Instrument, Redemption Price, Percentage   101.00%                
2028 Senior Notes                    
Debt Instrument [Line Items]                    
Senior notes, face amount     400,000,000     400,000,000        
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Repayments of Debt       $ 250,000,000.0            
Term Loan                    
Debt Instrument [Line Items]                    
Long-term Debt, Current Maturities     74,900,000     74,900,000   $ 74,900,000    
Debt Instrument, Unused Borrowing Capacity, Amount     $ 1,400,000,000     $ 1,400,000,000        
Accounts Receivable Securitization                    
Debt Instrument [Line Items]                    
Repayments of Debt             $ 250,000,000.0