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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. 29, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
security
Fair Value    
Less than 12 Months $ 125.5 $ 666.5
Greater than 12 Months 106.5 303.6
Total 232.0 970.1
Unrealized Loss    
Less than 12 Months 0.0 (0.6)
Greater than 12 Months (2.0) (8.7)
Total $ (2.0) $ (9.3)
Number of securities with an unrealized loss    
Less than 12 Months | security 54 141
Greater than 12 Months | security 25 66
Total | security 79 207
Corporate bonds    
Fair Value    
Less than 12 Months $ 28.7 $ 135.2
Greater than 12 Months 65.2 183.4
Total 93.9 318.6
Unrealized Loss    
Less than 12 Months 0.0 (0.2)
Greater than 12 Months (1.5) (6.5)
Total (1.5) (6.7)
U.S. treasury securities    
Fair Value    
Less than 12 Months 90.6 507.4
Greater than 12 Months 0.0 35.9
Total 90.6 543.3
Unrealized Loss    
Less than 12 Months 0.0 (0.4)
Greater than 12 Months 0.0 (0.2)
Total 0.0 (0.6)
Municipal bonds    
Fair Value    
Less than 12 Months 6.2 9.0
Greater than 12 Months 41.3 74.3
Total 47.5 83.3
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months (0.5) (2.0)
Total $ (0.5) (2.0)
U.S. agency securities    
Fair Value    
Less than 12 Months   14.9
Greater than 12 Months   10.0
Total   24.9
Unrealized Loss    
Less than 12 Months   0.0
Greater than 12 Months   0.0
Total   $ 0.0