Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Sep. 30, 2018
Dec. 17, 2018
Mar. 31, 2018
Document And Entity Information      
Entity Registrant Name GEE Group Inc.    
Entity Central Index Key 0000040570    
Document Type 10-K    
Document Period End Date Sep. 30, 2018    
Amendment Flag false    
Current Fiscal Year End Date --09-30    
Is Entity a Well-known Seasoned Issuer No    
Is Entity a Voluntary Filer No    
Is Entity's Reporting Status Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 21,462,741
Entity Common Stock, Shares Outstanding   11,204,635  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Ex Transition Period false    
Entity Shell Company false