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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
Dec. 29, 2024
USD ($)
segment
security
Jun. 30, 2024
USD ($)
security
Fair Value    
Less than 12 Months $ 159.9 $ 666.5
Greater than 12 Months 137.5 303.6
Total 297.4 970.1
Unrealized Loss    
Less than 12 Months (1.0) (0.6)
Greater than 12 Months (3.3) (8.7)
Total $ (4.3) $ (9.3)
Number of securities with an unrealized loss    
Less than 12 Months | security 70 141
Greater than 12 Months | security 48 66
Total | security 118 207
Corporate bonds    
Fair Value    
Less than 12 Months $ 100.1 $ 135.2
Greater than 12 Months 77.9 183.4
Total 178.0 318.6
Unrealized Loss    
Less than 12 Months (0.6) (0.2)
Greater than 12 Months (2.6) (6.5)
Total (3.2) (6.7)
U.S. treasury securities    
Fair Value    
Less than 12 Months 26.0 507.4
Greater than 12 Months 30.6 35.9
Total 56.6 543.3
Unrealized Loss    
Less than 12 Months (0.1) (0.4)
Greater than 12 Months 0.0 (0.2)
Total (0.1) (0.6)
Municipal bonds    
Fair Value    
Less than 12 Months 33.8 9.0
Greater than 12 Months 29.0 74.3
Total 62.8 83.3
Unrealized Loss    
Less than 12 Months (0.3) 0.0
Greater than 12 Months (0.7) (2.0)
Total (1.0) (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
Cash and Cash Equivalents    
Fair Value    
Less than 12 Months 14.0  
Unrealized Loss    
Less than 12 Months $ (0.1)  
Number of securities with an unrealized loss    
Less than 12 Months | segment 6