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Fair Value of Financial Instruments - (Details) - USD ($) $ in Millions	Mar. 30, 2025	Jun. 30, 2024
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 155.7	$ 97.3
Total short-term investments	599.4	1,128.7
Total current assets	70.1	0.0
Total other long-term investments	0.0	79.3
Total assets	825.2	1,305.3
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	92.5	100.8
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	262.1	417.0
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	224.8	552.7
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	15.5	0.0
Total short-term investments	3.0
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	3.0	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
MACOM Shares
Assets, Fair Value Disclosure [Abstract]
Total current assets	70.1	0.0
Total other long-term investments	0.0	79.3
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	113.1	87.3
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	7.8	0.0
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	4.3	0.0
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	15.0	10.0
Level 1
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	128.1	97.3
Total short-term investments	224.8	552.7
Total current assets	70.1	0.0
Total other long-term investments	0.0	79.3
Total assets	423.0	729.3
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. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	224.8	552.7
Level 1 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	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 | MACOM Shares
Assets, Fair Value Disclosure [Abstract]
Total current assets	70.1	0.0
Total other long-term investments	0.0	79.3
Level 1 | Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	113.1	87.3
Level 1 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 1 | Corporate bonds
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	15.0	10.0
Level 2
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	27.6	0.0
Total short-term investments	374.6	576.0
Total current assets	0.0	0.0
Total other long-term investments	0.0	0.0
Total assets	402.2	576.0
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	92.5	100.8
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	262.1	417.0
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	15.5	0.0
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	3.0	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 | MACOM Shares
Assets, Fair Value Disclosure [Abstract]
Total current assets	0.0	0.0
Total other long-term investments	0.0	0.0
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	7.8	0.0
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	4.3	0.0
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 0.0	$ 0.0

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