Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Dec. 24, 2024	Mar. 31, 2024
Document And Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Securities Act File Number	001-37759
Entity Registrant Name	OUTLOOK THERAPEUTICS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	38-3982704
Entity Address, Address Line One	111 S. Wood Avenue, Unit #100
Entity Address, City or Town	Iselin
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08852
City Area Code	609
Local Phone Number	619-3990
Title of 12(b) Security	Common Stock
Trading Symbol	OTLK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,905,635
Entity Public Float			$ 180.4
Entity Central Index Key	0001649989
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Firm ID	185
Auditor Name	KPMG LLP
Auditor Location	Philadelphia, Pennsylvania