Document And Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2019	Aug. 16, 2019	Dec. 28, 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 Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		18,489,842
Entity Public Float			$ 326,065,472
Document Type	10-K
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	1-10542
Entity Tax Identification Number	112165495
Entity Address, Address Line One	7201 West Friendly Avenue
Entity Address, City or Town	Greensboro
Entity Address, State or Province	North Carolina
Entity Address, Postal Zip Code	27410
City Area Code	336
Local Phone Number	294-4410