Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Sep. 30, 2017
Dec. 27, 2017
Mar. 31, 2017
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, 2017    
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 Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   10,012,847  
Entity Public Float     $ 36,011,032
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017