Document And Entity Information - shares	9 Months Ended
	Jun. 30, 2023	Aug. 10, 2023
Document And Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity 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	485 Route 1 South
Entity Address, Address Line Two	Building F, Suite 320
Entity Address, City or Town	Iselin
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	08830
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 Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		260,245,017
Entity Central Index Key	0001649989
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false