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Borrowings and Credit Arrangements - Additional Information (Detail) |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
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Jun. 25, 2022 | Sep. 27, 2021 USD ($) | Oct. 15, 2020 USD ($) | Sep. 28, 2020 | Dec. 17, 2018 USD ($) | Jan. 19, 2018 USD ($) | Apr. 25, 2016 USD ($) | Sep. 25, 2021 USD ($) | Mar. 27, 2021 USD ($) | Dec. 26, 2020 USD ($) debt_instrument | Sep. 25, 2021 USD ($) | Sep. 26, 2020 USD ($) | Sep. 28, 2019 USD ($) | Jun. 17, 2021 | Jun. 11, 2021 USD ($) | Sep. 29, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  |  | $ 21,600,000 | $ 0 | $ 800,000 |  |  |
Redemption price, percentage |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Current debt obligations, net of debt discount |  |  |  |  |  |  |  | $ 313,000,000.0 |  |  | 313,000,000.0 | 324,900,000 |  |  |  |
Proceeds from revolving credit line |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 750,000,000.0 | $ 480,000,000.0 |  |  |
Minimum | Mobidiag Oy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% |  |
Maximum | Mobidiag Oy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |
2018 Amended Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio maximum |  |  |  |  |  |  |  |  |  |  | 5.00 |  |  |  |  |
Interest coverage ratio |  |  |  |  |  |  |  |  |  |  | 3.75 |  |  |  |  |
2018 Amended Credit Facility | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio maximum | 4.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2017 Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  |  | $ (800,000) |  |  |  |  |  |
Number of debt instruments | debt_instrument |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Maximum range of present value of cash flow (percent) |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Weighted-average interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |
Interest rate at end of period |  |  |  |  |  |  |  |  |  |  |  | 1.40% |  |  |  |
Prior Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.79% |  |  |
Interest rate at end of period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.43%
Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 0.80% |  |  |  | 0.70% |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  | $ 900,000 | $ 3,100,000 | $ 7,100,000 |  |  |
Term of accounts receivable securitization program |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Accounts receivable from securitization |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Maximum borrowing under securitization program |  |  |  |  |  |  | $ 200,000,000 | 250,000,000 |  |  | 250,000,000 |  |  |  | $ 320,000,000 |
2021 Credit Agreement | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from revolving credit line |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  |  |  |  | 9,375,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Estimated Due At Maturity After Scheduled Principal Payments |  |  |  |  |  |  |  | $ 1,200,000,000 |  |  | $ 1,200,000,000 |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  |  |  |  | $ 28,125,000 |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2018 Amended Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Eurocurrency Rate | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  | $ 1,335,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Commitment Fee, Percentage |  | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Eurocurrency Rate | Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  | $ 3,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Term Loan | 2021 Term Loan | Eurocurrency Rate | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal Per Quarter |  | 18,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  | 1.08% |  |  | 1.08% |  |  |  |  |
Current debt obligations, net of debt discount |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | 250,000,000.0 |  |  |  |
Revolver | 2021 Revolver | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit borrowing capacity |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit | 2018 Amended Revolver |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit borrowing capacity |  |  |  |  | $ 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | 2018 Amended Revolver | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2025 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  | $ 950,000,000 |  |  | $ 950,000,000 |  |  |  |  |
Debt extinguishment loss |  |  |  |  |  |  |  |  | $ (21,600,000) |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  | 4.375% |  |  | 4.375% |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 5,800,000 |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 970,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Redemption, Premium Paid |  |  | $ 20,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount |  |  |  |  |  |  |  |  | $ 6,400,000 |  |  |  |  |  |  |
Senior Notes | 2028 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  | $ 400,000,000 |  |  | $ 400,000,000 |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  | 4.625% |  |  | 4.625% |  |  |  |  |
Proceeds from issuance of senior long-term debt |  |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |
Offering price, percent of face value |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
Percentage of redemption price, third period |  |  |  |  |  |  |  | 102.312% |  |  | 102.312% |  |  |  |  |
Percentage of redemption price, fourth period |  |  |  |  |  |  |  | 101.541% |  |  | 101.541% |  |  |  |  |
Percentage of redemption price, fifth period |  |  |  |  |  |  |  | 100.77% |  |  | 100.77% |  |  |  |  |
Percentage redemption price, sixth period |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |
Percentage price of principal amount for repurchase of senior notes |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |
Senior Notes | 2029 Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (percent) |  |  |  |  |  |  |  | 3.25% |  |  | 3.25% |  |  |  |  |
Redemption price, percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior notes principal amount |  |  |  |  |  |  |  | $ 950,000,000 |  |  | $ 950,000,000 |  |  |  |  |
Senior Notes | 2029 Senior Notes | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 103.25% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2029 Senior Notes | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 101.625% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2029 Senior Notes | Period Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 100.813% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2029 Senior Notes | Period Four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 2029 Senior Notes | Period Five |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |
Securitization Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |
Current debt obligations, net of debt discount |  |  |  |  |  |  |  | $ 248,500,000 |  |  | $ 248,500,000 | $ 0 |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  | 0.80% |  |  | 0.80% |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  | 0.80% |  |  | 0.80% |  |  |  |  |

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