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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Jun. 26, 2022
Jun. 27, 2021
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 192.9  
After One, Within Five Years 487.0  
After Five, Within Ten Years 14.7  
After Ten Years 54.7  
Total 749.3 $ 775.6
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 40.3  
After One, Within Five Years 121.9  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 162.2 141.3
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 116.2  
After One, Within Five Years 331.8  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 448.0 459.5
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 2.0  
After One, Within Five Years 1.9  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 3.9 15.8
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 34.4  
After One, Within Five Years 31.4  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 65.8 72.5
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 14.7  
After Ten Years 54.7  
Total $ 69.4 $ 20.0