Annual report pursuant to Section 13 and 15(d)


Cover - USD ($)
12 Months Ended
Sep. 30, 2021
Dec. 22, 2021
Mar. 31, 2021
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, 2021    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Common Stock Shares Outstanding   114,100,455  
Entity Public Float     $ 16,438,080
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity File Number 1-05707    
Entity Incorporation State Country Code IL    
Entity Tax Identification Number 36-6097429    
Entity Address Address Line 1 7751 Belfort Parkway    
Entity Address Address Line 2 Suite 150    
Entity Address City Or Town Jacksonville    
Entity Address State Or Province FL    
Entity Address Postal Zip Code 32256    
City Area Code 630    
Local Phone Number 954-0400    
Security 12b Title Common Stock, no par value    
Trading Symbol JOB    
Security Exchange Name NYSE