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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Mar. 27, 2022
Jun. 27, 2021
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 234.9  
After One, Within Five Years 533.3  
After Five, Within Ten Years 7.4  
After Ten Years 24.6  
Total 800.2 $ 775.6
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 39.4  
After One, Within Five Years 131.1  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 170.5 141.3
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 97.5  
After One, Within Five Years 368.6  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 466.1 459.5
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 67.0  
After One, Within Five Years 31.7  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 98.7 72.5
Non-U.S. government securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 0.0  
After One, Within Five Years 0.0  
After Five, Within Ten Years 7.4  
After Ten Years 0.0  
Total 7.4 0.0
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 29.0  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 29.0 50.0
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 0.0  
After Ten Years 24.6  
Total $ 24.6 $ 20.0