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Reportable Segments Schedule of Inventory by Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified | Dec. 28, 2014 | Jun. 29, 2014
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Segment Reporting Information [Line Items] |  |
Inventories | $ 332,548 us-gaap_InventoryNet | $ 284,780 us-gaap_InventoryNet
LED Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Inventories | 135,456 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = cree_LedProductsMember | 123,249 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = cree_LedProductsMember
Lighting Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Inventories | 181,848 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = cree_ProductLightingMember | 148,757 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = cree_ProductLightingMember
Power and RF Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Inventories | 10,190 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = cree_PowerandRFProductsMember | 8,019 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = cree_PowerandRFProductsMember
Total segment inventories [Member] |  |
Segment Reporting Information [Line Items] |  |
Inventories | 327,494 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 280,025 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
Unallocated inventories [Member] |  |
Segment Reporting Information [Line Items] |  |
Inventories | $ 5,054 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | $ 4,755 us-gaap_InventoryNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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