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 GULFSLOPE ENERGY, INC.    
Entity Central Index Key 0001341726    
Document Type 10-K    
Document Period End Date Sep. 30, 2020    
Entity File Number 000-51638    
Entity Incorporation, State Code DE    
Amendment Flag false    
Current Fiscal Year End Date --09-30    
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     $ 10,225,907
Shares held by non-affiliates     730,421,959
Entity share price     $ 0.014
Entity Common Stock, Shares Outstanding   1,268,240,346  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020