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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Millions | Mar. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Assets: |  |
Assets: | $ 2,180.0 |
Total | 825.2 | $ 35.3
Liabilities: |  |
Total | 1.3 | 2.0
Money Market Funds |  |
Assets: |  |
Assets: | 410.2 |
US Treasury Securities |  |
Assets: |  |
Assets: | 348.1 |
Commercial Paper |  |
Assets: |  |
Assets: | 49.8 |
Interest Rate Swap |  |
Assets: |  |
Total | 14.2 | 26.9
Forward foreign currency contracts |  |
Assets: |  |
Total | 2.9 | 8.4
Prepaid expenses and other current assets | Forward foreign currency contracts | Derivatives not designated as hedging instruments |  |
Assets: |  |
Interest rate swap at fair value | 2.9 | 8.4
Prepaid expenses and other current assets | Forward foreign currency contracts | Derivatives not designated as hedging instruments | Forward foreign currency contracts |  |
Assets: |  |
Interest rate swap at fair value |  | 8.4
Contingent consideration |  |
Liabilities: |  |
Total | 1.1 | 2.0
Forward foreign currency contracts |  |
Liabilities: |  |
Total | 0.2 |
Quoted Prices in Active Market for Identical Assets (Level 1) |  |
Assets: |  |
Total | 808.1 | 0.0
Liabilities: |  |
Total | 0.0 | 0.0
Quoted Prices in Active Market for Identical Assets (Level 1) | Money Market Funds |  |
Assets: |  |
Assets: | 410.2 |
Quoted Prices in Active Market for Identical Assets (Level 1) | US Treasury Securities |  |
Assets: |  |
Assets: | 348.1 |
Quoted Prices in Active Market for Identical Assets (Level 1) | Commercial Paper |  |
Assets: |  |
Assets: | 49.8 |
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 | 17.1 | 35.3
Liabilities: |  |
Total | 0.2 | 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 | 14.2 | 26.9
Significant Other Observable Inputs (Level 2) | Contingent consideration |  |
Liabilities: |  |
Total | 0.0 | 0.0
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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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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