Document and Entity Information - USD ($)
12 Months Ended
Jun. 24, 2018
Dec. 22, 2017
Aug. 18, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name CREE INC    
Entity Central Index Key 0000895419    
Current Fiscal Year End Date --06-24    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 24, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding     101,758,035
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float   $ 3,728,836,361