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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Dec. 27, 2020
Jun. 28, 2020
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 203.3  
After One, Within Five Years 375.2  
After Five, Within Ten Years 0.0  
After Ten Years 2.1  
Total 580.6 $ 790.9
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 23.7  
After One, Within Five Years 105.1  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 128.8 132.0
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 156.6  
After One, Within Five Years 248.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 404.6 480.1
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 3.0  
After One, Within Five Years 9.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 12.0 29.1
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 10.6  
After One, Within Five Years 13.1  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 23.7 52.9
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 7.7  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 7.7 83.3
Variable rate demand note    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 0.0  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 2.1  
Total 2.1 2.5
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 1.7  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total $ 1.7 $ 11.0