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Subsequent Events - Narrative (Details) - Subsequent Event - LED Business - USD ($) $ in Millions	Dec. 27, 2020	Sep. 27, 2020
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

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Namespace Prefix:	cree_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disposal Group, Including Discontinued Operation, Goodwill Impairment

+ References

No definition available.

+ Details

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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

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Data Type:	na
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Period Type:

X

- Details

Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=cree_LEDBusinessMember
Namespace Prefix:
Data Type:	na
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