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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions | Sep. 27, 2020 | Jun. 28, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 314.6 |
After One, Within Five Years | 387.5 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 702.1 | $ 802.9
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 24.1 |
After One, Within Five Years | 97.8 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 121.9 | 132.0
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 197.1 |
After One, Within Five Years | 265.4 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 462.5 | 480.1
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 8.5 |
After One, Within Five Years | 9.6 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 18.1 | 29.1
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 44.7 |
After One, Within Five Years | 14.7 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 59.4 | 52.9
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 33.7 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 33.7 | 95.3
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 6.5 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | $ 6.5 | $ 11.0

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