Fair Value of Financial Instruments - (Details) - USD ($) $ in Millions	Sep. 29, 2024	Jun. 30, 2024
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 151.1	$ 97.3
Total short-term investments	961.5	1,128.7
Total assets	1,191.9	1,305.3
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	469.1	552.7
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	376.9	417.0
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	88.6	100.8
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	9.9	16.7
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	10.0
Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	17.0	31.5
US corporation common stock
Assets, Fair Value Disclosure [Abstract]
US corporation common stock	79.3	79.3
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	143.1	87.3
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	8.0	10.0
Level 1
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	151.1	97.3
Total short-term investments	469.1	552.7
Total assets	699.5	729.3
Level 1 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	469.1	552.7
Level 1 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Municipal bonds
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 | U.S. agency securities
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 | US corporation common stock
Assets, Fair Value Disclosure [Abstract]
US corporation common stock	79.3	79.3
Level 1 | Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	143.1	87.3
Level 1 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	8.0	10.0
Level 2
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Total short-term investments	492.4	576.0
Total assets	492.4	576.0
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	376.9	417.0
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	88.6	100.8
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	9.9	16.7
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	10.0
Level 2 | Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	17.0	31.5
Level 2 | US corporation common stock
Assets, Fair Value Disclosure [Abstract]
US corporation common stock	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