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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Mar. 27, 2022
USD ($)
security
Jun. 27, 2021
USD ($)
security
Fair Value    
Less than 12 Months $ 653.9 $ 206.5
Greater than 12 Months 8.1 0.0
Total 662.0 206.5
Unrealized Loss    
Less than 12 Months (15.5) (0.4)
Greater than 12 Months (0.3) 0.0
Total $ (15.8) $ (0.4)
Number of securities with an unrealized loss    
Less than 12 Months | security 344 128
Greater than 12 Months | security 4 0
Total | security 348 128
Municipal bonds    
Fair Value    
Less than 12 Months $ 154.5 $ 13.4
Greater than 12 Months 1.0 0.0
Total 155.5 13.4
Unrealized Loss    
Less than 12 Months (3.1) 0.0
Greater than 12 Months 0.0 0.0
Total (3.1) 0.0
Corporate bonds    
Fair Value    
Less than 12 Months 435.8 133.8
Greater than 12 Months 7.1 0.0
Total 442.9 133.8
Unrealized Loss    
Less than 12 Months (12.0) (0.3)
Greater than 12 Months (0.3) 0.0
Total (12.3) (0.3)
U.S. agency securities    
Fair Value    
Less than 12 Months 3.9 10.7
Greater than 12 Months 0.0 0.0
Total 3.9 10.7
Unrealized Loss    
Less than 12 Months (0.1) 0.0
Greater than 12 Months 0.0 0.0
Total (0.1) 0.0
U.S. treasury securities    
Fair Value    
Less than 12 Months 59.7 47.9
Greater than 12 Months 0.0 0.0
Total 59.7 47.9
Unrealized Loss    
Less than 12 Months (0.3) (0.1)
Greater than 12 Months 0.0 0.0
Total $ (0.3) (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