v3.10.0.1
Document And Entity Information - shares
3 Months Ended
Sep. 30, 2018
Nov. 01, 2018
Document Document And Entity Information [Abstract]    
Entity Registrant Name UNIFI INC  
Entity Central Index Key 0000100726  
Trading Symbol ufi  
Current Fiscal Year End Date --06-30  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding (in shares)   18,382,797
Document Type 10-Q  
Document Period End Date Sep. 30, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false