Document and Entity Information - USD ($)
12 Months Ended
Sep. 30, 2019
Dec. 27, 2019
Mar. 31, 2019
Jan. 02, 2019
Jun. 01, 2018
May 01, 2018
Document And Entity Information      
Entity Registrant NameGULFSLOPE ENERGY, INC.     
Entity Central Index Key0001341726     
Document Type10-K     
Document Period End DateSep. 30, 2019     
Entity File Number000-51638     
Entity Incorporation, State CodeDE     
Amendment Flagfalse     
Current Fiscal Year End Date--09-30     
Entity Well-known Seasoned IssuerNo     
Entity Voluntary FilersNo     
Entity Current Reporting StatusYes     
Entity Interactive Data CurrentYes     
Entity Filer CategoryNon-accelerated Filer     
Entity Small Businesstrue     
Entity Emerging Growth Companytrue     
Entity Ex Transition Periodfalse     
Entity Shell Companyfalse     
Entity Public Float  $ 46,424,568   
Shares held by non-affiliates  635,952,993   
Entity share price  $ 0.073$ 0.045$ 0.075$ 0.065
Entity Common Stock, Shares Outstanding 1,148,609,520    
Document Fiscal Period FocusFY     
Document Fiscal Year Focus2019     

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