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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% |  |  |  |  |  |

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