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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Sep. 24, 2023
Jun. 25, 2023
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 1,125.2  
After One, Within Five Years 430.8  
After Five, Within Ten Years 9.7  
After Ten Years 19.9  
Total 1,585.6 $ 1,197.9
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 591.4  
After One, Within Five Years 98.9  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 690.3 260.4
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 218.1  
After One, Within Five Years 250.7  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 468.8 495.6
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 58.1  
After One, Within Five Years 81.2  
After Five, Within Ten Years 0.0  
After Ten Years 2.4  
Total 141.7 175.3
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 127.9  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 127.9  
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 72.6  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 72.6 76.8
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 57.1  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 57.1 112.3
Variable rate demand notes    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 0.0  
After One, Within Five Years 0.0  
After Five, Within Ten Years 9.7  
After Ten Years 17.5  
Total $ 27.2 $ 27.3