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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 30, 2024 | Dec. 30, 2023 | Apr. 01, 2023 | Mar. 30, 2024 | Apr. 01, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Intangible asset impairment charges |  |  |  | $ 31.1 | $ 0.0
Impairment of intangible assets | $ 0.9 |  | $ 0.0 | 5.2 | $ 0.0
Mobidiag | Right of use asset |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Intangible asset impairment charges |  | $ 12.5 |  |  |
In-process research and development | Mobidiag |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Intangible asset impairment charges |  | 4.3 |  |  |
Intangible Assets, Current | 22.4 |  |  | 22.4 |
Impairment of intangible assets |  | $ 4.3 |  |  |
Developed technology |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Impairment of intangible assets | 25.9 |  |  |  |
Finite-Lived Intangible Assets, Net | 13.9 |  |  | 13.9 |
Trade Names |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Impairment of intangible assets | 0.9 |  |  |  |
Finite-Lived Intangible Assets, Net | 0.5 |  |  | 0.5 |
2028 Senior Notes |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Fair value of debt instrument | 385.9 |  |  | 385.9 |
2029 Senior Notes |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Fair value of debt instrument | 852.6 |  |  | 852.6 |
Credit Agreement |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Borrowed principal | $ 1,200.0 |  |  | $ 1,200.0 |
2028 Senior Notes | Senior Notes |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Stated interest rate | 4.625% |  |  | 4.625% |
2029 Senior Notes | Senior Notes |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Stated interest rate | 3.25% |  |  | 3.25% |

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