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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions | Jun. 26, 2022 | Jun. 27, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 192.9 |
After One, Within Five Years | 487.0 |
After Five, Within Ten Years | 14.7 |
After Ten Years | 54.7 |
Total | 749.3 | $ 775.6
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 40.3 |
After One, Within Five Years | 121.9 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 162.2 | 141.3
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 116.2 |
After One, Within Five Years | 331.8 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 448.0 | 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 | 34.4 |
After One, Within Five Years | 31.4 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 65.8 | 72.5
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 | 14.7 |
After Ten Years | 54.7 |
Total | $ 69.4 | $ 20.0

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