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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions	Dec. 26, 2021	Jun. 27, 2021
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 96.9	$ 204.2
Total short-term investments	501.1	775.6
Total cash equivalents and short-term investments	598.0	979.8
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	133.2	141.3
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	312.2	459.5
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	4.0	15.8
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	12.8	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	21.0	50.0
Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	17.9	20.0
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	82.0	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
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	14.9	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	82.0	96.9
Total short-term investments	12.8	72.5
Total cash equivalents and short-term investments	94.8	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	12.8	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	82.0	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 | 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	14.9	107.3
Total short-term investments	488.3	703.1
Total cash equivalents and short-term investments	503.2	810.4
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	133.2	141.3
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	312.2	459.5
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	4.0	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	21.0	50.0
Level 2 | Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	17.9	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 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	14.9	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 cash equivalents and short-term investments	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 | 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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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