DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Policies)	6 Months Ended
	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Inotiv, Inc. and its subsidiaries (“we,” “our,” “us,” the “Company,” and “Inotiv”) comprise a leading contract research organization (“CRO”) dedicated to providing nonclinical and analytical drug discovery and development services to the pharmaceutical and medical device industries and selling a range of research-quality animals and diets to the same industries as well as academia and government clients. Our products and services focus on bringing new drugs and medical devices through the discovery and preclinical phases of development, all while increasing efficiency, improving data, and reducing the cost of discovering and taking new drugs and medical devices to market. Inotiv is committed to supporting discovery and development objectives as well as helping researchers realize the full potential of their critical research and development projects, all while working together to build a healthier and safer world. We are dedicated to practicing high standards of laboratory animal care and welfare. As a result of our strategic acquisition of Envigo RMS Holding Corp. (“Envigo”) in November 2021, which added a complementary research model platform, our full spectrum solutions now span two segments: Discovery and Safety Assessment (“DSA”) and Research Models and Services (“RMS”). Through our DSA segment, we support the discovery, nonclinical development and clinical development needs of researchers and clinicians for primarily small molecule drug candidates, as well as biotherapeutics and biomedical devices. Our scientists have skills in analytical instrumentation development, chemistry, computer software development, histology, pathology, physiology, surgery, analytical chemistry, drug metabolism, pharmacokinetics, and toxicology to make the services and products we provide increasingly valuable to our current and potential clients. Our principal clients are companies whose scientists are engaged in analytical chemistry, drug safety evaluation, clinical trials, drug metabolism studies, pharmacokinetics and basic research, from small start-up biotechnology companies to some of the largest global pharmaceutical companies. Through our RMS segment, we offer access to a wide range of small and large research models for basic research and drug discovery and development, as well as specialized models for specific diseases and therapeutic areas. We combine deep animal husbandry expertise and expanded access to scientists across the discovery and preclinical continuum, which reduces nonclinical lead times and provides enhanced project delivery. In conjunction with our DSA business, we have the ability to run selected nonclinical studies directly on-site at closely located research model facilities and provide access to innovative genetically engineered models and services solutions. Our principal clients include biopharmaceutical companies, CROs, and academic and government organizations. The accompanying unaudited interim condensed consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles ("GAAP") applicable to a going concern. This presentation contemplates the realization of assets and the satisfaction of liabilities in the normal course of business and does not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of the uncertainties described below. Basis of Presentation The Company has prepared the accompanying unaudited interim condensed consolidated financial statements pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Accordingly, they do not include all of the information and footnotes required by GAAP, and therefore should be read in conjunction with the Company’s audited consolidated financial statements, and the notes thereto, included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2023. In the opinion of management, the condensed consolidated financial statements for the three and six months ended March 31, 2024 and 2023 include all adjustments which are necessary for a fair presentation of the results of the interim periods and of the Company’s financial position at March 31, 2024. The results of operations for the three and six months ended March 31, 2024 are not necessarily indicative of the results for the fiscal year ending September 30, 2024. Certain prior year amounts have been reclassified within the condensed consolidated statements of operations and the consolidated statement of cash flows for consistency with the current year presentation. Specifically, depreciation expense has been combined with amortization of intangible assets. These reclassifications had no effect on the reported results of operations. Further, certain financing activities have been reclassified within the condensed consolidated statements of cash flows for consistency with the current year presentation.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and judgments that may affect the reported amounts of assets, liabilities, revenues, and expenses, and related disclosures of contingent assets and liabilities. These include, but are not limited to, management estimates in the calculation and timing of revenue recognition, pension liabilities, deferred tax assets and liabilities and the related valuation allowance. Although estimates are based upon management’s best estimate using historical experience, current events, and actions, actual results could differ from those estimates. Changes in estimates are reflected in reported results in the period in which they become known.
Consolidation	Consolidation The accompanying condensed consolidated financial statements are unaudited and have been prepared by the Company, including all subsidiaries and prior to December 23, 2023, a variable interest entity (“VIE”) it previously consolidated in accordance with GAAP. During December 2023, the Company entered into a transition services agreement with VSCS, one of the Company's transportation providers, to enable the in-house integration of Inotiv’s North American transportation operations. Following this transaction, Inotiv was no longer required to consolidate this entity. The VIE has not materially impacted our net assets or net loss. The Company successfully completed the in-house integration of its North American transportation operations during the three months ended March 31, 2024. The Company accounts for noncontrolling interests in accordance with Accounting Standards Codification (“ASC”) 810, “Consolidation” (“ASC 810”). ASC 810 requires companies with noncontrolling interests to disclose such interests as a portion of equity but separate from the parent’s equity. The noncontrolling interests’ portion of net loss is presented on the condensed consolidated statements of operations.
Concentration of Risk	Concentration of Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of trade receivables from customers in the biopharmaceutical, contract research, academic, and governmental sectors. The Company believes its exposure to credit risk is minimal, as the majority of the customers are predominantly well established and viable. Additionally, the Company maintains allowances for potential credit losses. The Company’s exposure to credit loss in the event that payment is not received for revenue recognized equals the outstanding trade receivables and contract assets less fees invoiced in advance.