Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions	Dec. 25, 2022	Jun. 26, 2022
Debt Securities, Available-for-sale [Line Items]
Within One Year	$ 836.9
After One, Within Five Years	468.0
After Five, Within Ten Years	14.7
After Ten Years	79.7
Total	1,399.3	$ 749.3
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	298.0
After One, Within Five Years	300.1
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	598.1	448.0
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	196.8
After One, Within Five Years	53.3
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	250.1	65.8
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Within One Year	196.9
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	196.9	0.0
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	66.1
After One, Within Five Years	109.6
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	175.7	162.2
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	79.7
Total	94.4	69.4
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Within One Year	64.0
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	64.0
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	15.1
After One, Within Five Years	5.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	$ 20.1	$ 3.9