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Borrowings and Credit Arrangements - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 27, 2021 | Oct. 15, 2020 | Dec. 25, 2021 | Jun. 26, 2021 | Dec. 26, 2020 | Sep. 25, 2021 | Jun. 17, 2021 | Sep. 28, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 3,068,300,000 |  |  | $ 3,025,200,000 |  |
Debt extinguishment losses |  |  | 700,000 |  | $ 21,600,000 |  |  |
Long-term Debt, Current Maturities |  |  | 248,700,000 |  |  | 313,000,000.0 |  |
Repayments of Other Debt |  |  | $ 63,600,000 |  |  |  |  |
Minimum | Mobidiag Oy |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 6.00% |
Maximum | Mobidiag Oy |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 7.00% |
2021 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from revolving credit line | $ 1,500,000,000 |  |  |  |  |  |  |
Revolver | 2021 Revolver |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility borrowings | 2,000,000,000 |  |  |  |  |  |  |
Senior Notes | 2025 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.375% |  |  |  |  |
Senior notes, face amount |  | $ 950,000,000 | $ 950,000,000 |  |  |  |  |
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% |  |  |  |  |
Senior Notes | 2029 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.25% |  |  |  |  | 3.25%
Senior notes |  |  | $ 950,000,000 |  |  |  |  | $ 950,000,000
Debt Instrument, Offering Price, Percent Of Face Value |  |  |  |  |  |  |  | 1
2028 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Senior notes, face amount |  |  | 400,000,000 |  |  |  |  |
Term Loan | 2021 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt extinguishment losses |  |  | 700,000 |  |  |  |  |
Debt Issuance Costs, Net |  |  | 7,000,000 |  |  |  |  |
Accounts Receivable Securitization |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term Debt, Current Maturities |  |  | $ 248,500,000 |  |  | $ 248,500,000 |  |
Debt, Weighted Average Interest Rate |  |  | 0.79% |  |  |  |  |
Secured Term Loan | 2021 Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 1.10% |  |  |  |  |
Senior notes, face amount | 1,500,000,000 |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Eurocurrency Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Commitment Fee, Percentage |  |  | 0.15% |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter | 1,335,000,000 |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Minimum | Eurocurrency Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter | 3,750,000 |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Maximum | Eurocurrency Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter | $ 18,750,000 |  |  |  |  |  |  |

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