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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Mar. 26, 2023
USD ($)
security
Jun. 26, 2022
USD ($)
security
Fair Value    
Less than 12 Months $ 279.7 $ 650.8
Greater than 12 Months 497.9 9.3
Total 777.6 660.1
Unrealized Loss    
Less than 12 Months (0.6) (22.6)
Greater than 12 Months (20.8) (0.4)
Total $ (21.4) $ (23.0)
Number of securities with an unrealized loss    
Less than 12 Months | security 67 346
Greater than 12 Months | security 262 5
Total | security 329 351
Corporate bonds    
Fair Value    
Less than 12 Months $ 176.5 $ 431.1
Greater than 12 Months 352.4 8.3
Total 528.9 439.4
Unrealized Loss    
Less than 12 Months (0.5) (17.4)
Greater than 12 Months (16.3) (0.4)
Total (16.8) (17.8)
Municipal bonds    
Fair Value    
Less than 12 Months 22.1 150.0
Greater than 12 Months 112.4 1.0
Total 134.5 151.0
Unrealized Loss    
Less than 12 Months (0.1) (4.4)
Greater than 12 Months (3.7) 0.0
Total (3.8) (4.4)
U.S. treasury securities    
Fair Value    
Less than 12 Months 54.6 65.8
Greater than 12 Months 31.2 0.0
Total 85.8 65.8
Unrealized Loss    
Less than 12 Months 0.0 (0.7)
Greater than 12 Months (0.7) 0.0
Total (0.7) (0.7)
U.S. agency securities    
Fair Value    
Less than 12 Months 26.5 3.9
Greater than 12 Months 1.9 0.0
Total 28.4 3.9
Unrealized Loss    
Less than 12 Months 0.0 (0.1)
Greater than 12 Months (0.1) 0.0
Total $ (0.1) $ (0.1)