v3.26.1
Cover - USD ($)
12 Months Ended
Sep. 30, 2025
Dec. 12, 2025
Mar. 31, 2025
Cover [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description Sonnet Biotherapeutics Holdings, Inc. is filing this Amendment No. 1 to its Annual Report on Form 10-K for the year ended September 30, 2025 for purpose of substituting the correct version of the Report of Independent Registered Public Accounting Firm. Other than as disclosed above and the dating of this Amendment, there are no changes to that Annual Report.      
Document Annual Report true    
Document Transition Report false    
Document Period End Date Sep. 30, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Current Fiscal Year End Date --09-30    
Entity File Number 001-35570    
Entity Registrant Name SONNET BIOTHERAPEUTICS HOLDINGS, INC.    
Entity Central Index Key 0001106838    
Entity Tax Identification Number 20-2932652    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 100 Overlook Center    
Entity Address, Address Line Two Suite 102    
Entity Address, City or Town Princeton    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 08540    
City Area Code (609)    
Local Phone Number 375-2227    
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     $ 4,150,174
Entity Common Stock, Shares Outstanding   1  
Documents Incorporated by Reference [Text Block] None    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Listing, Par Value Per Share $ 0.0001