Document And Entity Information - USD ($)	12 Months Ended
	Jun. 27, 2021	Aug. 20, 2021	Dec. 25, 2020
Cover [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 Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.10 per share
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding (in shares)		18,517,713
Entity Public Float			$ 233,348,635
ICFR Auditor Attestation Flag	true
Document Type	10-K
Document Period End Date	Jun. 27, 2021
Document Fiscal Year Focus	2021
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	11-2165495
Entity Incorporation, State or Country Code	NY
Entity Address, Address Line One	7201 West Friendly Avenue
Entity Address, City or Town	Greensboro
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27410
City Area Code	336
Local Phone Number	294-4410
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission in connection with the registrant’s 2021 Annual Meeting of Shareholders are incorporated by reference in Part III of this Form 10-K to the extent described herein.