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Financial Statement Details - Non-cash Operating Activities (Details) - USD ($) $ in Millions	6 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Increase of right-of-use assets and lease liabilities	$ 15.5	$ 0.0
Lease asset and liability modifications, net	4.6	$ 0.0
Increase of right-of-use assets and lease liabilities upon adoption of ASC 842	$ 12.2

X

- Definition

Increase (Decrease) in Lease Asset (Liability)

+ References

No definition available.

+ Details

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

X

- Definition

Modifications of Lease Assets, Net

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(2)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

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Period Type:	duration