Document And Entity Information - USD ($)	12 Months Ended
	Jun. 25, 2017	Aug. 23, 2017	Dec. 23, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	UNIFI INC
Entity Central Index Key	0000100726
Trading Symbol	ufi
Current Fiscal Year End Date	--06-25
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)		18,250,743
Entity Public Float			$ 513,765,262
Document Type	10-K
Document Period End Date	Jun. 25, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Amendment Flag	false