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Subsequent Events - Narrative (Details) - Subsequent Event - LED Business - USD ($) $ in Millions | Dec. 27, 2020 | Sep. 27, 2020
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Subsequent Event [Line Items] |  |
Goodwill impairment | $ 6.9 | $ 105.7
Disposal Group, Including Discontinued Operation, Assets Held For Sale Impairment | $ 19.5 |

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- Definition Disposal Group, Including Discontinued Operation, Assets Held For Sale Impairment + References No definition available. + Details
Name: | cree_DisposalGroupIncludingDiscontinuedOperationAssetsHeldForSaleImpairment
Namespace Prefix: | cree_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disposal Group, Including Discontinued Operation, Goodwill Impairment + References No definition available. + Details
Name: | cree_DisposalGroupIncludingDiscontinuedOperationGoodwillImpairment
Namespace Prefix: | cree_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=cree_LEDBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |