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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 29, 2024 | Sep. 30, 2023
--- | --- | ---
Assets: |  |
Assets: | $ 2,439.1 |
Total | 836.1 | $ 35.3
Liabilities: |  |
Total | 1.5 | 2.0
Money Market Funds |  |
Assets: |  |
Assets: | 371.2 |
US Treasury Securities |  |
Assets: |  |
Assets: | 398.1 |
Commercial Paper |  |
Assets: |  |
Assets: | 49.5 |
Interest Rate Swap |  |
Assets: |  |
Total | 14.7 | 26.9
Forward foreign currency contracts |  |
Assets: |  |
Total | 2.6 | 8.4
Prepaid expenses and other current assets | Forward foreign currency contracts | Derivatives not designated as hedging instruments |  |
Assets: |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value |  | 8.4
Contingent consideration |  |
Liabilities: |  |
Total | 1.1 | 2.0
Forward foreign currency contracts |  |
Liabilities: |  |
Total | 0.4 |
Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Total | 818.8 | 0.0
Liabilities: |  |
Total | 0.0 | 0.0
Quoted Prices in Active Market for Identical Assets (Level 1) | Money Market Funds |  |
Assets: |  |
Assets: | 371.2 |
Quoted Prices in Active Market for Identical Assets (Level 1) | US Treasury Securities |  |
Assets: |  |
Assets: | 398.1 |
Quoted Prices in Active Market for Identical Assets (Level 1) | Commercial Paper |  |
Assets: |  |
Assets: | 49.5 |
Quoted Prices in Active Market for Identical Assets (Level 1) | Interest Rate Swap |  |
Assets: |  |
Total | 0.0 | 0.0
Quoted Prices in Active Market for Identical Assets (Level 1) | Forward foreign currency contracts |  |
Assets: |  |
Total | 0.0 | 0.0
Quoted Prices in Active Market for Identical Assets (Level 1) | Contingent consideration |  |
Liabilities: |  |
Total | 0.0 | 0.0
Quoted Prices in Active Market for Identical Assets (Level 1) | Forward foreign currency contracts |  |
Liabilities: |  |
Total | 0.0 |
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Total | 17.3 | 35.3
Liabilities: |  |
Total | 0.4 | 0.0
Significant Other Observable Inputs (Level 2) | Money Market Funds |  |
Assets: |  |
Assets: | 0.0 |
Significant Other Observable Inputs (Level 2) | US Treasury Securities |  |
Assets: |  |
Assets: | 0.0 |
Significant Other Observable Inputs (Level 2) | Commercial Paper |  |
Assets: |  |
Assets: | 0.0 |
Significant Other Observable Inputs (Level 2) | Interest Rate Swap |  |
Assets: |  |
Total | 14.7 | 26.9
Significant Other Observable Inputs (Level 2) | Prepaid expenses and other current assets | Forward foreign currency contracts | Derivatives not designated as hedging instruments | Forward foreign currency contracts |  |
Assets: |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value |  | 8.4
Significant Other Observable Inputs (Level 2) | Contingent consideration |  |
Liabilities: |  |
Total | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Forward foreign currency contracts | Prepaid expenses and other current assets | Forward foreign currency contracts | Derivatives not designated as hedging instruments |  |
Assets: |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 2.6 |
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Total | 0.0 | 0.0
Liabilities: |  |
Total | 1.1 | 2.0
Significant Unobservable Inputs (Level 3) | Money Market Funds |  |
Assets: |  |
Assets: | 0.0 |
Significant Unobservable Inputs (Level 3) | US Treasury Securities |  |
Assets: |  |
Assets: | 0.0 |
Significant Unobservable Inputs (Level 3) | Commercial Paper |  |
Assets: |  |
Assets: | 0.0 |
Significant Unobservable Inputs (Level 3) | Interest Rate Swap |  |
Assets: |  |
Total | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Forward foreign currency contracts |  |
Assets: |  |
Total | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Contingent consideration |  |
Liabilities: |  |
Total | 1.1 | $ 2.0
Significant Unobservable Inputs (Level 3) | Forward foreign currency contracts |  |
Liabilities: |  |
Total | $ 0.0 |

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