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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details) $ in Millions | Sep. 27, 2020 USD ($) security | Jun. 28, 2020 USD ($) 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 | $ 51.6 | $ 65.8
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 | 51.6 | 65.8
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
Number of securities in an unrealized loss position for less than 12 months | security | 16 | 46
Number of securities in an unrealized loss position for greater than 12 months | security | 0 | 0
Number of securities in an unrealized loss position | security | 16 | 46
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of securities in an unrealized loss position for less than 12 months | $ 4.0 | $ 14.3
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 | 4.0 | 14.3
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
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of securities in an unrealized loss position for less than 12 months | 7.8 | 29.1
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 | 7.8 | 29.1
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 | 0.0
Accumulated unrealized loss of securities in an unrealized loss position | 0.0 | 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 | 16.0 | 8.6
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 | 16.0 | 8.6
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. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of securities in an unrealized loss position for less than 12 months | 23.8 | 13.8
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 | 23.8 | 13.8
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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