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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Jun. 25, 2023
USD ($)
security
Jun. 26, 2022
USD ($)
security
Fair Value    
Less than 12 Months $ 520.9 $ 650.8
Greater than 12 Months 463.1 9.3
Total 984.0 660.1
Unrealized Loss    
Less than 12 Months (1.6) (22.6)
Greater than 12 Months (21.1) (0.4)
Total $ (22.7) $ (23.0)
Number of securities with an unrealized loss    
Less than 12 Months | security 95 346
Greater than 12 Months | security 234 5
Total | security 329 351
Corporate bonds    
Fair Value    
Less than 12 Months $ 151.5 $ 431.1
Greater than 12 Months 324.1 8.3
Total 475.6 439.4
Unrealized Loss    
Less than 12 Months (0.5) (17.4)
Greater than 12 Months (16.2) (0.4)
Total (16.7) (17.8)
U.S. treasury securities    
Fair Value    
Less than 12 Months 229.3 65.8
Greater than 12 Months 31.1 0.0
Total 260.4 65.8
Unrealized Loss    
Less than 12 Months (0.5) (0.7)
Greater than 12 Months (0.9) 0.0
Total (1.4) (0.7)
Municipal bonds    
Fair Value    
Less than 12 Months 61.4 150.0
Greater than 12 Months 105.9 1.0
Total 167.3 151.0
Unrealized Loss    
Less than 12 Months (0.4) (4.4)
Greater than 12 Months (4.0) 0.0
Total (4.4) (4.4)
U.S. agency securities    
Fair Value    
Less than 12 Months 74.8 3.9
Greater than 12 Months 2.0 0.0
Total 76.8 3.9
Unrealized Loss    
Less than 12 Months (0.2) (0.1)
Greater than 12 Months 0.0 0.0
Total (0.2) $ (0.1)
Commercial paper    
Fair Value    
Less than 12 Months 3.9  
Greater than 12 Months 0.0  
Total 3.9  
Unrealized Loss    
Less than 12 Months 0.0  
Greater than 12 Months 0.0  
Total $ 0.0