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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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