Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Sep. 30, 2020
Dec. 08, 2020
Mar. 31, 2020
Cover [Abstract]      
Entity Registrant Name Sonnet BioTherapeutics Holdings, Inc.    
Entity Central Index Key 0001106838    
Document Type 10-K    
Document Period End Date Sep. 30, 2020    
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 Flag true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 5,713,094
Entity Common Stock, Shares Outstanding   17,175,729  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020