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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Mar. 13, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Mar. 14, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation costs capitalized		$ 0	$ 0
Weighted average estimated fair value of stock options granted (in dollars per share)		$ 2.58	$ 1.44	$ 5.72
Aggregate intrinsic value exercised		$ 15	$ 23	$ 230
2021 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares remained available for grants (in shares)		956,162
Inotiv, Inc. 2024 Equity Incentive Plan (the “2024 Plan”)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares added under amended and restated plan (in shares)	2,250,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized					1,500,000
Stock Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period ( in years )		3 years
Period over which options expire		10 years
Expiration period, post termination		30 days
Stock Options \| Envigo
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Period over which options expire		10 years
Expiration period, post termination		1 year
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period ( in years )		2 years
Shares granted, value		$ 0
Restricted Stock Units (in thousands)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares granted, value		0
Unrecognized compensation expense expected to vest		$ 4,712
Time over which unrecognized compensation expense expected to vest (in years)		1 year 3 months 14 days
Fair value of restricted shares granted		$ 2,803	1,513	3,908
Fair value of restricted shares vested		$ 2,209	$ 1,666	$ 940
Restricted Stock Units (in thousands) \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period ( in years )		1 year
Restricted Stock Units (in thousands) \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting period ( in years )		5 years