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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions	Jun. 27, 2021	Jun. 28, 2020
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 204.2	$ 303.9
Total short-term investments	775.6	790.9
Common stock of non-U.S. corporations	0.0	55.9
Total assets	979.8	1,150.7
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	141.3	132.0
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	459.5	480.1
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	15.8	29.1
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	72.5	52.9
Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	16.5	83.3
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	50.0	11.0
Variable rate demand note
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	20.0	2.5
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	96.9	199.9
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	16.0	0.0
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	6.0	19.6
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	19.0
Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	54.3
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	62.4	11.1
Variable rate demand note
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	22.9	0.0
Level 1
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	96.9	218.9
Total short-term investments	72.5	52.9
Common stock of non-U.S. corporations	0.0	0.0
Total assets	169.4	271.8
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	72.5	52.9
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 note
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	96.9	199.9
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	0.0	19.0
Level 1 | Certificates of deposit
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 note
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	107.3	85.0
Total short-term investments	703.1	738.0
Common stock of non-U.S. corporations	0.0	55.9
Total assets	810.4	878.9
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	141.3	132.0
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	459.5	480.1
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	15.8	29.1
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	16.5	83.3
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	50.0	11.0
Level 2 | Variable rate demand note
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	20.0	2.5
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	16.0	0.0
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	6.0	19.6
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2 | Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	54.3
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	62.4	11.1
Level 2 | Variable rate demand note
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	22.9	0.0
Level 3
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Total short-term investments	0.0	0.0
Common stock of non-U.S. corporations	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 note
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 | Certificates of deposit
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 note
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 0.0	$ 0.0

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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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