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Investments - Schedule of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time (Details)
$ in Millions
Jun. 30, 2024
USD ($)
security
Jun. 25, 2023
USD ($)
security
Fair Value    
Less than 12 Months $ 666.5 $ 520.9
Greater than 12 Months 303.6 463.1
Total 970.1 984.0
Unrealized Loss    
Less than 12 Months (0.6) (1.6)
Greater than 12 Months (8.7) (21.1)
Total $ (9.3) $ (22.7)
Number of securities with an unrealized loss    
Less than 12 Months | security 141 95
Greater than 12 Months | security 66 234
Total | security 207 329
Corporate bonds    
Fair Value    
Less than 12 Months $ 135.2 $ 151.5
Greater than 12 Months 183.4 324.1
Total 318.6 475.6
Unrealized Loss    
Less than 12 Months (0.2) (0.5)
Greater than 12 Months (6.5) (16.2)
Total (6.7) (16.7)
U.S. treasury securities    
Fair Value    
Less than 12 Months 507.4 229.3
Greater than 12 Months 35.9 31.1
Total 543.3 260.4
Unrealized Loss    
Less than 12 Months (0.4) (0.5)
Greater than 12 Months (0.2) (0.9)
Total (0.6) (1.4)
Municipal bonds    
Fair Value    
Less than 12 Months 9.0 61.4
Greater than 12 Months 74.3 105.9
Total 83.3 167.3
Unrealized Loss    
Less than 12 Months 0.0 (0.4)
Greater than 12 Months (2.0) (4.0)
Total (2.0) (4.4)
U.S. agency securities    
Fair Value    
Less than 12 Months 14.9 74.8
Greater than 12 Months 10.0 2.0
Total 24.9 76.8
Unrealized Loss    
Less than 12 Months 0.0 (0.2)
Greater than 12 Months 0.0 0.0
Total $ 0.0 (0.2)
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