v3.25.2
Fair Value Measurements - Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 28, 2025
Sep. 28, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost $ 1,735.2 $ 2,160.2
Short-Term Investments, Unrealized Gain 0.1  
Short-Term Investments, Unrealized Loss 0.0  
Total available-for-sale securities 842.8 992.9
Cash, Cash Equivalents, and Short-Term Investments 1,879.0  
Cash, Cash Equivalents, and Short-Term Investments, Fair Value 1,879.1  
Investments 143.9  
Cash    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 1,036.3  
Unrealized Gains 0.0  
Unrealized Losses 0.0  
Fair Value 1,036.3  
Money Market Funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 461.9  
Unrealized Gains 0.0  
Unrealized Losses 0.0  
Fair Value 461.9 341.7
Investments 0.0  
US Treasury Securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cost 237.0  
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss 380.8  
Investments, Unrealized Gain 0.1  
Investments, Unrealized Loss 0.0  
Total available-for-sale securities 380.9 $ 626.3
Investments $ 143.9