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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions | Sep. 26, 2021 | Jun. 27, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 124.6 |
After One, Within Five Years | 451.7 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 20.0 |
Total | 596.3 | $ 775.6
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 27.5 |
After One, Within Five Years | 109.9 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 137.4 | 141.3
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 65.5 |
After One, Within Five Years | 303.8 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 369.3 | 459.5
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 5.5 |
After One, Within Five Years | 8.3 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 13.8 | 15.8
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 16.6 |
After One, Within Five Years | 29.7 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 46.3 | 72.5
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 9.5 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 9.5 | 16.5
Variable rate demand notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 0.0 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 20.0 |
Total | $ 20.0 | $ 20.0

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