| Cover | Feb. 08, 2021 | Aug. 05, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Feb. 8, 2021 | |
| Entity Registrant Name | BGSF, INC. | |
| Entity Incorporation, State or Country Code | DE | |
| Entity File Number | 001-36704 | |
| Entity Tax Identification Number | 26-0656684 | |
| Entity Address, Address Line One | 5850 Granite Parkway, Suite 730 | |
| Entity Address, City or Town | Plano | |
| Entity Address, State or Province | TX | |
| Entity Address, Postal Zip Code | 75024 | |
| City Area Code | 972 | |
| Local Phone Number | 692-2400 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Entity Emerging Growth Company | false | |
| Title of 12(b) Security | Common Stock | |
| Trading Symbol | BGSF | |
| Security Exchange Name | NYSE | |
| Entity Central Index Key | 0001474903 | |
| Amendment Flag | false |
