XML 90 R55.htm IDEA: XBRL DOCUMENT v3.21.2
Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Sep. 26, 2021
USD ($)
security
Jun. 27, 2021
USD ($)
security
Fair Value    
Less than 12 Months $ 136.6 $ 227.9
Greater than 12 Months 0.0 0.0
Total 136.6 227.9
Unrealized Loss    
Less than 12 Months (0.2) (0.4)
Greater than 12 Months 0.0 0.0
Total $ (0.2) $ (0.4)
Number of securities with an unrealized loss    
Less than 12 Months | security 75 134
Greater than 12 Months | security 0 0
Total | security 75 134
Municipal bonds    
Fair Value    
Less than 12 Months $ 14.0 $ 28.8
Greater than 12 Months 0.0 0.0
Total 14.0 28.8
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 0.0
Corporate bonds    
Fair Value    
Less than 12 Months 94.1 133.8
Greater than 12 Months 0.0 0.0
Total 94.1 133.8
Unrealized Loss    
Less than 12 Months (0.2) (0.3)
Greater than 12 Months 0.0 0.0
Total (0.2) (0.3)
U.S. agency securities    
Fair Value    
Less than 12 Months 7.7 16.7
Greater than 12 Months 0.0 0.0
Total 7.7 16.7
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 0.0
U.S. treasury securities    
Fair Value    
Less than 12 Months 20.8 47.9
Greater than 12 Months 0.0 0.0
Total 20.8 47.9
Unrealized Loss    
Less than 12 Months 0.0 (0.1)
Greater than 12 Months 0.0 0.0
Total $ 0.0 (0.1)
Certificates of deposit    
Fair Value    
Less than 12 Months   0.7
Greater than 12 Months   0.0
Total   0.7
Unrealized Loss    
Less than 12 Months   0.0
Greater than 12 Months   0.0
Total   $ 0.0