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]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Sep. 30, 2021    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --09-30    
Entity File Number 000-51638    
Entity Registrant Name GULFSLOPE ENERGY, INC.    
Entity Central Index Key 0001341726    
Entity Tax Identification Number 16-1689008    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 1331 Lamar St.    
Entity Address, Address Line Two Suite 1665     
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77010    
City Area Code (281)    
Local Phone Number 918-4100    
Title of 12(b) Security Common Stock, par value $0.001    
Trading Symbol GSPE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 11,916,797
Entity Common Stock, Shares Outstanding   1,268,240,346  
Shares held by non-affiliates     768,824,959
Share Price     $ 0.0155