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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 25, 2023
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 97.3	$ 258.1
Total short-term investments	1,128.7	1,197.9
Total assets	1,305.3	1,456.0
Common stock of U.S. corporation	79.3	0.0
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	417.0	495.6
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	552.7	260.4
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	100.8	175.3
Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	31.5	112.3
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	10.0	76.8
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	16.7	50.2
Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	27.3
Common stock of U.S. corporation
Assets, Fair Value Disclosure [Abstract]
Common stock of U.S. corporation	79.3	0.0
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	87.3	230.4
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	10.0	20.7
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	7.0
Level 1
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	97.3	251.1
Total short-term investments	552.7	260.4
Total assets	729.3	511.5
Common stock of U.S. corporation	79.3	0.0
Level 1 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	552.7	260.4
Level 1 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Common stock of U.S. corporation
Assets, Fair Value Disclosure [Abstract]
Common stock of U.S. corporation	79.3	0.0
Level 1 | Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	87.3	230.4
Level 1 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	10.0	20.7
Level 1 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	7.0
Total short-term investments	576.0	937.5
Total assets	576.0	944.5
Common stock of U.S. corporation	0.0	0.0
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	417.0	495.6
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	100.8	175.3
Level 2 | Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	31.5	112.3
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	10.0	76.8
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	16.7	50.2
Level 2 | Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	27.3
Level 2 | Common stock of U.S. corporation
Assets, Fair Value Disclosure [Abstract]
Common stock of U.S. corporation	0.0	0.0
Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 0.0	$ 7.0

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