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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Dec. 29, 2019 USD ($) security | Jun. 30, 2019 USD ($) security
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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

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