| Document and Entity Information | Aug. 04, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 4, 2021 |
| Entity Registrant Name | UNIFI, INC. |
| Entity Central Index Key | 0000100726 |
| Entity Emerging Growth Company | false |
| Entity File Number | 1-10542 |
| Entity Incorporation, State or Country Code | NY |
| Entity Tax Identification Number | 11-2165495 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.10 per share |
| Trading Symbol | UFI |
| Security Exchange Name | NYSE |
