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Stock-Based Compensation (Narrative) (Details) | 9 Months Ended
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Mar. 29, 2015 plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of equity-based compensation plans | 1 cree_ShareBasedCompensationEquityBasedCompensationPlanNumber
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%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate / us-gaap_AwardTypeAxis = cree_EmployeeStockPurchasePlanMember
Number of opportunities to purchase common stock at discount, per year | 2 cree_NumberOfTimesEmployeesCanPurchaseStockPerYear / us-gaap_AwardTypeAxis = cree_EmployeeStockPurchasePlanMember
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%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate / us-gaap_AwardTypeAxis = cree_EmployeeStockPurchasePlanMember / us-gaap_PlanNameAxis = cree_EmployeeStockPurchasePlanPriortoSecondQuarterFiscal2012AmendmentMember
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%cree_SharebasedCompensationArrangementbySharebasedPaymentAwardDiscountfromMarketPriceBeginningofParticipationPeriodorPurchaseDate / us-gaap_AwardTypeAxis = cree_EmployeeStockPurchasePlanMember / us-gaap_PlanNameAxis = cree_EmployeeStockPurchasePlanAfterSecondQuarterFiscal2012AmendmentMember

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- Definition Number of times employees can purchase stock under Employee Stock Purchase Plan (ESPP), per year + References No definition available. + Details
Name: | cree_NumberOfTimesEmployeesCanPurchaseStockPerYear
Namespace Prefix: | cree_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

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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
Name: | cree_ShareBasedCompensationEquityBasedCompensationPlanNumber
Namespace Prefix: | cree_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPricePurchaseDate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + 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=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_AwardTypeAxis=cree_EmployeeStockPurchasePlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=cree_EmployeeStockPurchasePlanAfterSecondQuarterFiscal2012AmendmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PlanNameAxis=cree_EmployeeStockPurchasePlanPriortoSecondQuarterFiscal2012AmendmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |