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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions | Mar. 27, 2022 | Jun. 27, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 234.9 |
After One, Within Five Years | 533.3 |
After Five, Within Ten Years | 7.4 |
After Ten Years | 24.6 |
Total | 800.2 | $ 775.6
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 39.4 |
After One, Within Five Years | 131.1 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 170.5 | 141.3
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 97.5 |
After One, Within Five Years | 368.6 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 466.1 | 459.5
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 2.0 |
After One, Within Five Years | 1.9 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 3.9 | 15.8
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 67.0 |
After One, Within Five Years | 31.7 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 98.7 | 72.5
Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 0.0 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 7.4 |
After Ten Years | 0.0 |
Total | 7.4 | 0.0
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 29.0 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 29.0 | 50.0
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 | 24.6 |
Total | $ 24.6 | $ 20.0

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