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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Jun. 25, 2023
Jun. 26, 2022
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 845.4  
After One, Within Five Years 322.8  
After Five, Within Ten Years 9.7  
After Ten Years 20.0  
Total 1,197.9 $ 749.3
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 303.7  
After One, Within Five Years 191.9  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 495.6 448.0
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 220.9  
After One, Within Five Years 39.5  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 260.4 65.8
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 91.5  
After One, Within Five Years 81.4  
After Five, Within Ten Years 0.0  
After Ten Years 2.4  
Total 175.3 162.2
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 112.3  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 112.3  
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 66.8  
After One, Within Five Years 10.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 76.8 3.9
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 50.2  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 50.2  
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 17.6  
Total $ 27.3 $ 69.4