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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Mar. 28, 2021
USD ($)
security
Jun. 28, 2020
USD ($)
security
Fair Value    
Less than 12 Months $ 153.1 $ 65.8
Greater than 12 Months 0.0 0.0
Total 153.1 65.8
Unrealized Loss    
Less than 12 Months (0.2) 0.0
Greater than 12 Months 0.0 0.0
Total $ (0.2) $ 0.0
Number of securities with an unrealized loss    
Less than 12 Months | security 104 46
Greater than 12 Months | security 0 0
Total | security 104 46
Maximum    
Unrealized Loss    
Less than 12 Months   $ (0.1)
Municipal bonds    
Fair Value    
Less than 12 Months $ 6.4 14.3
Greater than 12 Months 0.0 0.0
Total 6.4 14.3
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 0.0
Corporate bonds    
Fair Value    
Less than 12 Months 113.4 29.1
Greater than 12 Months 0.0 0.0
Total 113.4 29.1
Unrealized Loss    
Less than 12 Months (0.2) 0.0
Greater than 12 Months 0.0 0.0
Total (0.2) 0.0
U.S. agency securities    
Fair Value    
Less than 12 Months 13.2 8.6
Greater than 12 Months 0.0 0.0
Total 13.2 8.6
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 0.0
U.S. treasury securities    
Fair Value    
Less than 12 Months 19.4 13.8
Greater than 12 Months 0.0 0.0
Total 19.4 13.8
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 $ 0.0
Certificates of deposit    
Fair Value    
Less than 12 Months 0.7  
Greater than 12 Months 0.0  
Total 0.7  
Unrealized Loss    
Less than 12 Months 0.0  
Greater than 12 Months 0.0  
Total $ 0.0