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Document And Entity Information - USD ($)
 12 Months Ended
Jan. 01, 2023
Mar. 15, 2023
Jun. 25, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 01, 2023    
Document Transition Report false    
Entity File Number 001-36704    
Entity Registrant Name BGSF, INC.    
Entity Incorporation, State or Country Code DE    
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    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol BGSF    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 126,930,147
Entity Common Stock, Shares Outstanding   10,789,903  
Entity Central Index Key 0001474903    
Current Fiscal Year End Date --01-01    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2022