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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Sep. 25, 2022
USD ($)
security
Jun. 26, 2022
USD ($)
security
Fair Value    
Less than 12 Months $ 578.1 $ 650.8
Greater than 12 Months 44.6 9.3
Total 622.7 660.1
Unrealized Loss    
Less than 12 Months (27.6) (22.6)
Greater than 12 Months (2.3) (0.4)
Total $ (29.9) $ (23.0)
Number of securities with an unrealized loss    
Less than 12 Months | security 305 346
Greater than 12 Months | security 27 5
Total | security 332 351
Corporate bonds    
Fair Value    
Less than 12 Months $ 376.5 $ 431.1
Greater than 12 Months 39.8 8.3
Total 416.3 439.4
Unrealized Loss    
Less than 12 Months (20.3) (17.4)
Greater than 12 Months (2.1) (0.4)
Total (22.4) (17.8)
Municipal bonds    
Fair Value    
Less than 12 Months 146.3 150.0
Greater than 12 Months 2.9 1.0
Total 149.2 151.0
Unrealized Loss    
Less than 12 Months (6.1) (4.4)
Greater than 12 Months (0.1) 0.0
Total (6.2) (4.4)
U.S. treasury securities    
Fair Value    
Less than 12 Months 55.3 65.8
Greater than 12 Months 0.0 0.0
Total 55.3 65.8
Unrealized Loss    
Less than 12 Months (1.2) (0.7)
Greater than 12 Months 0.0 0.0
Total (1.2) (0.7)
U.S. agency securities    
Fair Value    
Less than 12 Months 0.0 3.9
Greater than 12 Months 1.9 0.0
Total 1.9 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)