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Investments - Schedule of Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Dec. 29, 2024
Jun. 30, 2024
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 616.4  
After One, Within Five Years 172.0  
After Ten Years 2.4  
Total 790.8 $ 1,128.7
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 308.2  
After One, Within Five Years 30.6  
After Ten Years 0.0  
Total 338.8 552.7
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 254.2  
After One, Within Five Years 100.8  
After Ten Years 0.0  
Total 355.0 417.0
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 42.0  
After One, Within Five Years 40.6  
After Ten Years 2.4  
Total 85.0 100.8
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 12.0  
After One, Within Five Years 0.0  
After Ten Years 0.0  
Total $ 12.0 $ 31.5