Stock-Based Compensation (Narrative) (Details)	9 Months Ended
Mar. 25, 2018 plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity-based compensation plans	1
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum contribution of employee's compensation, percentage	15.00%
Number of opportunities to purchase common stock at discount, per year	2
Employee Stock Purchase Plan Prior to Second Quarter Fiscal 2012 Amendment [Member] \| Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock plan purchase discount at purchase date	15.00%
Employee Stock Purchase Plan After Second Quarter Fiscal 2012 Amendment [Member] \| Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock plan purchase discount at beginning of participation period or purchase date	15.00%

Number of times employees can purchase stock under Employee Stock Purchase Plan (ESPP), per year

No definition available.

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- Definition

Number of equity-based compensation plans from which awards can be granted to employees and directors.

+ References

No definition available.

+ Details

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Namespace Prefix:	cree_
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Balance Type:	na
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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price,Beginning of Participation Period or Purchase Date

+ References

No definition available.

+ Details

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Namespace Prefix:	cree_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Discount rate from fair value on purchase date that participants pay for shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Data Type:	num:percentItemType
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- 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

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

Name:	us-gaap_PlanNameAxis=cree_EmployeeStockPurchasePlanPriortoSecondQuarterFiscal2012AmendmentMember
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- Details

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