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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 24, 2018	Jun. 25, 2017
Intematix Corporation
Related Party Transaction [Line Items]
Purchases from related party	$ 3.3	$ 2.3

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cree_IntematixCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: