Document And Entity Information - USD ($)
12 Months Ended
Jun. 24, 2018
Aug. 16, 2018
Dec. 22, 2017
Document Document And Entity Information [Abstract]      
Entity Registrant Name UNIFI INC    
Entity Central Index Key 0000100726    
Trading Symbol ufi    
Current Fiscal Year End Date --06-24    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding (in shares)   18,373,375  
Entity Public Float     $ 551,124,384
Document Type 10-K    
Document Period End Date Jun. 24, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Amendment Flag false