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Document And Entity Information - shares
6 Months Ended
Dec. 24, 2017
Jan. 25, 2018
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 Common Stock, Shares Outstanding (in shares)   18,297,602
Document Type 10-Q  
Document Period End Date Dec. 24, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Amendment Flag false