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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions	Dec. 27, 2020	Jun. 28, 2020
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 220.8	$ 303.9
Total short-term investments	580.6	790.9
Common stock of non-U.S. corporations	66.1	55.9
Total assets	867.5	1,150.7
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	128.8	132.0
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	404.6	480.1
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	12.0	29.1
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	23.7	52.9
Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	7.7	83.3
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	1.7	11.0
Variable rate demand note
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	2.1	2.5
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	135.6	199.9
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	14.5	19.6
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	51.5	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	19.2	11.1
Level 1
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	187.1	218.9
Total short-term investments	23.7	52.9
Common stock of non-U.S. corporations	0.0	0.0
Total assets	210.8	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	23.7	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	135.6	199.9
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	51.5	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 2
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	33.7	85.0
Total short-term investments	556.9	738.0
Common stock of non-U.S. corporations	66.1	55.9
Total assets	656.7	878.9
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	128.8	132.0
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	404.6	480.1
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	12.0	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	7.7	83.3
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	1.7	11.0
Level 2 | Variable rate demand note
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	2.1	2.5
Level 2 | Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	14.5	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	19.2	11.1
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 | 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

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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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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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