XML 91 R53.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Dec. 29, 2019
USD ($)
security
Jun. 30, 2019
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities in an unrealized loss position for less than 12 months $ 145.0 $ 55.8
Fair value of securities in an unrealized loss position for greater than 12 months 1.5 48.4
Fair value of securities in an unrealized loss position 146.5 104.2
Accumulated unrealized loss of securities in an unrealized loss position for less than 12 months (0.1) 0.0
Accumulated unrealized loss of securities in an unrealized loss position for greater than 12 months 0.0 (0.1)
Accumulated unrealized loss of securities in an unrealized loss position $ (0.1) $ (0.1)
Number of securities in an unrealized loss position for less than 12 months | security 111 46
Number of securities in an unrealized loss position for greater than 12 months | security 2 47
Number of securities in an unrealized loss position | security 113 93
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities in an unrealized loss position for less than 12 months $ 8.4 $ 4.3
Fair value of securities in an unrealized loss position for greater than 12 months 1.5 29.8
Fair value of securities in an unrealized loss position 9.9 34.1
Accumulated unrealized loss of securities in an unrealized loss position for less than 12 months 0.0 0.0
Accumulated unrealized loss of securities in an unrealized loss position for greater than 12 months 0.0 (0.1)
Accumulated unrealized loss of securities in an unrealized loss position 0.0 (0.1)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities in an unrealized loss position for less than 12 months 87.2 41.8
Fair value of securities in an unrealized loss position for greater than 12 months 0.0 14.7
Fair value of securities in an unrealized loss position 87.2 56.5
Accumulated unrealized loss of securities in an unrealized loss position for less than 12 months (0.1) 0.0
Accumulated unrealized loss of securities in an unrealized loss position for greater than 12 months 0.0 0.0
Accumulated unrealized loss of securities in an unrealized loss position (0.1) 0.0
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities in an unrealized loss position for less than 12 months 13.6 7.7
Fair value of securities in an unrealized loss position for greater than 12 months 0.0 0.0
Fair value of securities in an unrealized loss position 13.6 7.7
Accumulated unrealized loss of securities in an unrealized loss position for less than 12 months 0.0 0.0
Accumulated unrealized loss of securities in an unrealized loss position for greater than 12 months 0.0 0.0
Accumulated unrealized loss of securities in an unrealized loss position 0.0 0.0
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities in an unrealized loss position for less than 12 months 35.8 2.0
Fair value of securities in an unrealized loss position for greater than 12 months 0.0 3.9
Fair value of securities in an unrealized loss position 35.8 5.9
Accumulated unrealized loss of securities in an unrealized loss position for less than 12 months 0.0 0.0
Accumulated unrealized loss of securities in an unrealized loss position for greater than 12 months 0.0 0.0
Accumulated unrealized loss of securities in an unrealized loss position $ 0.0 $ 0.0