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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
Segment Reporting Information [Line Items]    
Inventories $ 332,548us-gaap_InventoryNet $ 284,780us-gaap_InventoryNet
LED Products [Member]    
Segment Reporting Information [Line Items]    
Inventories 135,456us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= cree_LedProductsMember		 123,249us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= cree_LedProductsMember
Lighting Products [Member]    
Segment Reporting Information [Line Items]    
Inventories 181,848us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= cree_ProductLightingMember		 148,757us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= cree_ProductLightingMember
Power and RF Products [Member]    
Segment Reporting Information [Line Items]    
Inventories 10,190us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= cree_PowerandRFProductsMember		 8,019us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= cree_PowerandRFProductsMember
Total segment inventories [Member]    
Segment Reporting Information [Line Items]    
Inventories 327,494us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 280,025us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
Unallocated inventories [Member]    
Segment Reporting Information [Line Items]    
Inventories $ 5,054us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember		 $ 4,755us-gaap_InventoryNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember