Percent of equity interests in first-tier foreign subsidiaries used as collateral.

No definition available.

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

- Definition

Default interest rate spread.

+ References

No definition available.

+ Details

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

- Definition

Denominator of ratio of consolidated EBITDA to interest expense.

+ References

No definition available.

+ Details

Name:	cree_DenominatorofratioofconsolidatedEBITDAtointerestexpense
Namespace Prefix:	cree_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Denominator of ratio of consolidated funding indebtedness to EBITDA.

+ References

No definition available.

+ Details

Name:	cree_DenominatorofratioofconsolidatedfundingindebtednesstoEBITDA
Namespace Prefix:	cree_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Incremental basis points in base rate calculation.

+ References

No definition available.

+ Details

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

- Definition

Numerator of ratio of consolidated EBITDA to interest expense.

+ References

No definition available.

+ Details

Name:	cree_NumeratorofratioofconsolidatedEBITDAtointerestexpense
Namespace Prefix:	cree_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Numerator of ratio of consolidated funding indebtedness to EBITDA.

+ References

No definition available.

+ Details

Name:	cree_NumeratorofratioofconsolidatedfundingindebtednesstoEBITDA
Namespace Prefix:	cree_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_FederalFundsEffectiveSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Event Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	0 Months Ended
	Dec. 28, 2014	Dec. 28, 2014	Jan. 09, 2015
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 150	$ 150
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.08%	0.08%
New Credit Agreement [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 500
Percent of equity interests in first-tier foreign subsidiaries used as collateral			65.00%
Default interest rate spread			2.00%
Numerator of ratio of consolidated funding indebtedness to EBITDA			3.00
Denominator of ratio of consolidated funding indebtedness to EBITDA			1.00
Numerator of ratio of consolidated EBITDA to interest expense			3.00
Denominator of ratio of consolidated EBITDA to interest expense			1.00
Minimum [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.09%
Maximum [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage			0.20%
Federal Funds Effective Swap Rate [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Incremental basis points in base rate calculation			0.50%
Base Rate [Member] \| Minimum [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.00%
Base Rate [Member] \| Maximum [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.50%
London Interbank Offered Rate (LIBOR) [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Incremental basis points in base rate calculation			1.00%
London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.80%
London Interbank Offered Rate (LIBOR) [Member] \| Maximum [Member] \| New Credit Agreement [Member]
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%