Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($) $ in Millions	Jul. 03, 2021	Jun. 27, 2020
Goodwill
Goodwill	$ 368.9	$ 368.9
Optical Communications
Goodwill
Goodwill	363.5	363.5
Commercial Lasers
Goodwill
Goodwill	$ 5.4	$ 5.4

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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