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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Dec. 26, 2021
USD ($)
security
Jun. 27, 2021
USD ($)
security
Fair Value    
Less than 12 Months $ 228.1 $ 227.9
Greater than 12 Months 0.0 0.0
Total 228.1 227.9
Unrealized Loss    
Less than 12 Months (1.6) (0.4)
Greater than 12 Months 0.0 0.0
Total $ (1.6) $ (0.4)
Number of securities with an unrealized loss    
Less than 12 Months | security 111 134
Greater than 12 Months | security 0 0
Total | security 111 134
Municipal bonds    
Fair Value    
Less than 12 Months $ 41.8 $ 28.8
Greater than 12 Months 0.0 0.0
Total 41.8 28.8
Unrealized Loss    
Less than 12 Months (0.3) 0.0
Greater than 12 Months 0.0 0.0
Total (0.3) 0.0
Corporate bonds    
Fair Value    
Less than 12 Months 180.3 133.8
Greater than 12 Months 0.0 0.0
Total 180.3 133.8
Unrealized Loss    
Less than 12 Months (1.3) (0.3)
Greater than 12 Months 0.0 0.0
Total (1.3) (0.3)
U.S. agency securities    
Fair Value    
Less than 12 Months 4.0 16.7
Greater than 12 Months 0.0 0.0
Total 4.0 16.7
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 2.0 47.9
Greater than 12 Months 0.0 0.0
Total 2.0 47.9
Unrealized Loss    
Less than 12 Months 0.0 (0.1)
Greater than 12 Months 0.0 0.0
Total $ 0.0 (0.1)
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