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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions	Mar. 26, 2023	Jun. 26, 2022
Debt Securities, Available-for-sale [Line Items]
Within One Year	$ 989.6
After One, Within Five Years	405.5
After Five, Within Ten Years	14.7
After Ten Years	43.3
Total	1,453.1	$ 749.3
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	356.5
After One, Within Five Years	239.7
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	596.2	448.0
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	249.1
After One, Within Five Years	49.5
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	298.6	65.8
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Within One Year	203.5
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	203.5	0.0
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	88.9
After One, Within Five Years	96.3
After Five, Within Ten Years	0.0
After Ten Years	2.4
Total	187.6	162.2
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	56.9
After One, Within Five Years	20.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	76.9	3.9
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	40.9
Total	55.6	$ 69.4
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Within One Year	34.7
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	$ 34.7

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