Document And Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2021	Dec. 01, 2021	Mar. 31, 2021
Document And Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2021
Entity File Number	000-23357
Entity Registrant Name	INOTIV, INC.
Entity Incorporation, State or Country Code	IN
Entity Tax Identification Number	35-1345024
Entity Address, Address Line One	2701 KENT AVENUE
Entity Address, City or Town	WEST LAFAYETTE
Entity Address, State or Province	IN
Entity Address, Postal Zip Code	47906
City Area Code	765
Local Phone Number	463-4527
Title of 12(b) Security	Common Shares
Trading Symbol	NOTV
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
ICFR Auditor Attestation Flag	false
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Public Float			$ 172,225,000
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,266,099
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0000720154
Current Fiscal Year End Date	--09-30