Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 28, 2024	Sep. 28, 2024
Assets:
Total available-for-sale securities	$ 406.6	$ 992.9
Total	426.1	996.8
Liabilities:
Contingent consideration	1.1	1.1
Total	1.1	13.9
Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Total	406.6	992.9
Liabilities:
Contingent consideration	0.0	0.0
Total	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets:
Total	19.5	3.9
Liabilities:
Contingent consideration	0.0	0.0
Total	0.0	12.8
Significant Unobservable Inputs (Level 3)
Assets:
Total	0.0	0.0
Liabilities:
Contingent consideration	1.1	1.1
Total	1.1	1.1
Interest Rate Swap
Assets:
Interest rate swaps	9.4	3.1
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value		0.2
Interest Rate Swap | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Interest rate swaps	0.0	0.0
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value		0.0
Interest Rate Swap | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	9.4	3.1
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value		0.2
Interest Rate Swap | Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swaps	0.0	0.0
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value		0.0
Foreign currency option contracts
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.4	0.8
Foreign currency option contracts | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.0	0.0
Foreign currency option contracts | Significant Other Observable Inputs (Level 2)
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.4	0.8
Foreign currency option contracts | Significant Unobservable Inputs (Level 3)
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.0	0.0
Forward foreign currency contracts
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	9.7
Liabilities:
Foreign Currency Contracts, Liability, Fair Value Disclosure		12.6
Forward foreign currency contracts | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.0
Liabilities:
Foreign Currency Contracts, Liability, Fair Value Disclosure		0.0
Forward foreign currency contracts | Significant Other Observable Inputs (Level 2)
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	9.7
Liabilities:
Foreign Currency Contracts, Liability, Fair Value Disclosure		12.6
Forward foreign currency contracts | Significant Unobservable Inputs (Level 3)
Assets:
Foreign Currency Contract, Asset, Fair Value Disclosure	0.0
Liabilities:
Foreign Currency Contracts, Liability, Fair Value Disclosure		0.0
Money Market Funds
Assets:
Assets:	152.1	341.7
Money Market Funds | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Assets:	152.1	341.7
Money Market Funds | Significant Other Observable Inputs (Level 2)
Assets:
Assets:	0.0	0.0
Money Market Funds | Significant Unobservable Inputs (Level 3)
Assets:
Assets:	0.0	0.0
US Treasury Securities
Assets:
Total available-for-sale securities	254.5	626.3
US Treasury Securities | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Total available-for-sale securities	254.5	626.3
US Treasury Securities | Significant Other Observable Inputs (Level 2)
Assets:
Total available-for-sale securities	0.0	0.0
US Treasury Securities | Significant Unobservable Inputs (Level 3)
Assets:
Total available-for-sale securities	$ 0.0	0.0
Commercial Paper
Assets:
Assets:		24.9
Commercial Paper | Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Assets:		24.9
Commercial Paper | Significant Other Observable Inputs (Level 2)
Assets:
Assets:		0.0
Commercial Paper | Significant Unobservable Inputs (Level 3)
Assets:
Assets:		$ 0.0