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v3.20.4

Retirement Savings Plan - Narrative (Details) $ in Millions | 12 Months Ended
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Jun. 28, 2020 USD ($) numberOfCompensationPlan | Jun. 30, 2019 USD ($) | Jun. 24, 2018 USD ($)
Retirement Benefits [Abstract] |  |  |
Number of employee benefit plans | numberOfCompensationPlan | 1 |  |
Employer discretionary contribution amount | $ | $ 7.7 | $ 7.3 | $ 5.2

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- Definition Employee Benefit Retirement Savings Plans, Number Of Plans + References No definition available. + Details
Name: | cree_EmployeeBenefitRetirementSavingsPlansNumberOfPlans
Namespace Prefix: | cree_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration