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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions | Jun. 27, 2021 | Jun. 28, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 199.7 |
After One, Within Five Years | 555.9 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 20.0 |
Total | 775.6 | $ 790.9
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 24.7 |
After One, Within Five Years | 116.6 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 141.3 | 132.0
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 80.3 |
After One, Within Five Years | 379.2 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 459.5 | 480.1
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 3.5 |
After One, Within Five Years | 12.3 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 15.8 | 29.1
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 24.7 |
After One, Within Five Years | 47.8 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 72.5 | 52.9
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 16.5 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 16.5 | 83.3
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 50.0 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 50.0 | 11.0
Variable rate demand note |  |
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 | $ 2.5

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