Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
12 Months Ended
Sep. 30, 2020
Dec. 28, 2020
Mar. 31, 2020
Cover [Abstract]      
Entity Registrant Name GEE Group Inc.    
Entity Central Index Key 0000040570    
Document Type 10-K    
Amendment Flag false    
Entity Voluntary Filers No    
Current Fiscal Year End Date --09-30    
Entity Well Known Seasoned Issuer No    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company false    
Entity Current Reporting Status Yes    
Document Period End Date Sep. 30, 2020    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Entity Common Stock Shares Outstanding   17,667,123  
Entity Public Float     $ 4,319,181
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes