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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Mar. 26, 2021
Oct. 15, 2020
Sep. 28, 2020
Jun. 26, 2021
Mar. 27, 2021
Dec. 26, 2020
Jun. 27, 2020
Jun. 26, 2021
Jun. 27, 2020
Jun. 17, 2021
Jun. 11, 2021
Sep. 26, 2020
Mar. 31, 2020
Dec. 17, 2018
Debt Instrument [Line Items]                            
Long-term debt       $ 3,115,300,000       $ 3,115,300,000       $ 3,038,800,000    
Debt extinguishment losses       0     $ 0 21,600,000 $ 0          
Long-term Debt, Current Maturities       460,600,000       $ 460,600,000       324,900,000    
Debt Instrument, Redemption Price, Percentage     40.00%                      
Minimum | Mobidiag Oy                            
Debt Instrument [Line Items]                            
Stated interest rate                   6.00%        
Maximum | Mobidiag Oy                            
Debt Instrument [Line Items]                            
Stated interest rate                   7.00%        
Amended Term Loan | Percentage Added to Eurodollar Rate                            
Debt Instrument [Line Items]                            
Basis spread on variable rate               1.00%            
Revolver | 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  
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                
Debt Instrument, Unamortized Discount           $ 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       74,800,000       74,800,000       74,900,000    
Debt Instrument, Unused Borrowing Capacity, Amount       1,400,000,000       1,400,000,000            
Accounts Receivable Securitization                            
Debt Instrument [Line Items]                            
Long-term Debt, Current Maturities       $ 320,000,000.0       $ 320,000,000.0       $ 0    
Repayments of Debt $ 250,000,000.0               $ 250,000,000.0          
Maximum borrowing under asset securitization agreement                     $ 320,000,000.0      
Debt, Weighted Average Interest Rate       0.78%       0.78%