v3.26.1

Cover - USD ($)	12 Months Ended
Cover - USD ($)	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

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Sonnet BioTherapeutics Holdings, Inc. 10-K/A