| Cover | Aug. 05, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 11, 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 |
