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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
Mar. 30, 2025
USD ($)
security
Jun. 30, 2024
USD ($)
security
Fair Value    
Less than 12 Months $ 152.7 $ 666.5
Greater than 12 Months 71.3 303.6
Total 224.0 970.1
Unrealized Loss    
Less than 12 Months (0.8) (0.6)
Greater than 12 Months (1.9) (8.7)
Total $ (2.7) $ (9.3)
Number of securities with an unrealized loss    
Less than 12 Months | security 55 141
Greater than 12 Months | security 31 66
Total | security 86 207
Corporate bonds    
Fair Value    
Less than 12 Months $ 82.5 $ 135.2
Greater than 12 Months 48.1 183.4
Total 130.6 318.6
Unrealized Loss    
Less than 12 Months (0.6) (0.2)
Greater than 12 Months (1.4) (6.5)
Total (2.0) (6.7)
U.S. treasury securities    
Fair Value    
Less than 12 Months 37.9 507.4
Greater than 12 Months 0.0 35.9
Total 37.9 543.3
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 32.3 9.0
Greater than 12 Months 23.2 74.3
Total 55.5 83.3
Unrealized Loss    
Less than 12 Months (0.2) 0.0
Greater than 12 Months (0.5) (2.0)
Total $ (0.7) (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