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DESCRIPTION OF THE BUSINESS	12 Months Ended
DESCRIPTION OF THE BUSINESS	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF THE BUSINESS	DESCRIPTION OF THE BUSINESS Inotiv, Inc. and its subsidiaries (“we,” “our,” “us,” "the Company,” “Inotiv”) began operating in 1975 as Bioanalytical Systems, Inc. Bioanalytical Systems, Inc. was incorporated in 1974 and we completed our initial public offering in 2000. On March 18, 2021, the Company filed Articles of Amendment to the Company’s Second Amended and Restated Articles of Incorporation, as amended, and amended its Second Amended and Restated Bylaws, as amended, to reflect a corporate name change from Bioanalytical Systems, Inc. to Inotiv, Inc. Our stock is traded on the Nasdaq Stock Market LLC under the symbol “NOTV.” We are headquartered in West Lafayette, Indiana. Our headquarters mailing address is 2701 Kent Avenue, West Lafayette, Indiana, 47906, and the telephone number at that location is (765) 463-4527. Our Internet site is www.inotiv.com. The information contained on our website is not a part of this Report and is not incorporated by reference herein.