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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions | Jun. 26, 2022 | Jun. 27, 2021
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 244.3 | $ 204.2
Total short-term investments | 749.3 | 775.6
Total assets | 993.6 | 979.8
Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 162.2 | 141.3
Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 448.0 | 459.5
U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 3.9 | 15.8
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 65.8 | 72.5
Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 16.5
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 50.0
Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 69.4 | 20.0
Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 115.9 | 96.9
Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 16.0
U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 6.0
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 69.0 | 0.0
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 59.4 | 62.4
Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 22.9
Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 184.9 | 96.9
Total short-term investments | 65.8 | 72.5
Total assets | 250.7 | 169.4
Level 1 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | Corporate bonds |  |
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 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 65.8 | 72.5
Level 1 | Certificates of deposit |  |
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 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 115.9 | 96.9
Level 1 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 69.0 | 0.0
Level 1 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 59.4 | 107.3
Total short-term investments | 683.5 | 703.1
Total assets | 742.9 | 810.4
Level 2 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 162.2 | 141.3
Level 2 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 448.0 | 459.5
Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 3.9 | 15.8
Level 2 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 2 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 16.5
Level 2 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 50.0
Level 2 | Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 69.4 | 20.0
Level 2 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 2 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 16.0
Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 6.0
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 | 59.4 | 62.4
Level 2 | Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 22.9
Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Total short-term investments | 0.0 | 0.0
Total assets | 0.0 | 0.0
Level 3 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Variable rate demand notes |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 0.0 | $ 0.0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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