Commitments and Contingencies	3 Months Ended
Aug. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. COMMITMENTS AND CONTINGENCIES We are involved in environmental remediation and monitoring activities at our Randolph, Wisconsin manufacturing facility and we accrue for related costs, when such costs are determined to be probable and estimable. We currently utilize a pump and treat remediation strategy, which includes semi-annual monitoring and reporting, consulting, and maintenance of monitoring wells. These annual remediation costs are expensed as incurred and have ranged from approximately $40 to $130 per year over the past five years. We estimated that the remaining liability for these costs are $916 as of both August 31, 2025 and May 31, 2025, measured on an undiscounted basis over an estimated period of 15 years. In fiscal 2019, we performed an updated Corrective Measures Study on the site, per a request from the Wisconsin Department of Natural Resources ("WDNR"), and are currently working with the WDNR regarding potential alternative remediation strategies going forward. We believe that the current pump and treat strategy is appropriate for the site. In fiscal 2022, in collaboration with the WDNR, we initiated an in-situ chemical remediation pilot study, which ran over a two-year period. The results of this study were submitted to the WDNR as part of our standard annual report. If the WDNR were to require a change from the current pump and treat remediation strategy, this change could result in an increase in future costs and, ultimately, an increase in the currently recorded liability, with an offsetting charge to operations in the period recorded. We recorded $100 as a current liability as of August 31, 2025, and the remaining $816 is recorded in other non-current liabilities in the condensed consolidated balance sheets. Shareholder Litigation On July 18, 2025, Operating Engineers Construction Industry and Miscellaneous Pension Fund filed a putative class action complaint in the United States District Court for the Western District of Michigan against the Company, John Adent, and David Naemura. The complaint asserts claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 based on allegedly false and misleading public statements and omissions by defendants during the period January 5, 2023 through June 3, 2025 relating to the integration of the 3M business into Neogen. The complaint seeks, among other things, unspecified monetary damages, reasonable costs and expenses and/or other relief as deemed appropriate by the Court. Defendants have not yet responded to the complaint. On August 27, 2025, the Company, John Adent, Steven J. Quinlan, James C. Borel, William T. Boehm, Ronald D. Green, Ralph A. Rodriguez, James P. Tobin, Darci L. Vetter, and Catherine E. Woteki were named in a putative class action filed in Minnesota’s Second Judicial District for Ramsey County. The complaint asserts claims under Sections 11, 12(a)(2), and 15 of the Securities Act of 1933 based on allegedly false and misleading public statements by defendants in the offering materials issued in connection with the 2022 transaction in which Neogen acquired 3M’s Food Safety Business. The complaint seeks, among other things, unspecified monetary damages, reasonable costs and expenses, recission, and/or such other equitable or injunctive relief as deemed appropriate by the Court. Defendants have not yet responded to the complaint. Stockholder Demands On August 13 and August 15, 2025, the Company received two separate stockholder litigation demands requesting that the Board investigate the allegations in the Federal Action and pursue claims on the Company’s behalf based on those allegations. On October 4, 2025, the Board established a litigation committee to consider and investigate the demands. The Company intends to vigorously defend the matters. Given the uncertainty of litigation and the preliminary stage of the cases, we cannot estimate the reasonably possible loss or range of loss that may result from the actions. Other than the shareholder items noted above, we are subject to certain legal and other proceedings that, in the opinion of management, are not expected to have a material effect on our financial statements.

Commitments and Contingencies

3 Months Ended

Aug. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

9. COMMITMENTS AND CONTINGENCIES

We are involved in environmental remediation and monitoring activities at our Randolph, Wisconsin manufacturing facility and we accrue for related costs, when such costs are determined to be probable and estimable. We currently utilize a pump and treat remediation strategy, which includes semi-annual monitoring and reporting, consulting, and maintenance of monitoring wells. These annual remediation costs are expensed as incurred and have ranged from approximately $40 to $130 per year over the past five years. We estimated that the remaining liability for these costs are $916 as of both August 31, 2025 and May 31, 2025, measured on an undiscounted basis over an estimated period of 15 years. In fiscal 2019, we performed an updated Corrective Measures Study on the site, per a request from the Wisconsin Department of Natural Resources ("WDNR"), and are currently working with the WDNR regarding potential alternative remediation strategies going forward. We believe that the current pump and treat strategy is appropriate for the site. In fiscal 2022, in collaboration with the WDNR, we initiated an in-situ chemical remediation pilot study, which ran over a two-year period. The results of this study were submitted to the WDNR as part of our standard annual report. If the WDNR were to require a change from the current pump and treat remediation strategy, this change could result in an increase in future costs and, ultimately, an increase in the currently recorded liability, with an offsetting charge to operations in the period recorded. We recorded $100 as a current liability as of August 31, 2025, and the remaining $816 is recorded in other non-current liabilities in the condensed consolidated balance sheets.

Shareholder Litigation

On July 18, 2025, Operating Engineers Construction Industry and Miscellaneous Pension Fund filed a putative class action complaint in the United States District Court for the Western District of Michigan against the Company, John Adent, and David Naemura. The complaint asserts claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 based on allegedly false and misleading public statements and omissions by defendants during the period January 5, 2023 through June 3, 2025 relating to the integration of the 3M business into Neogen. The complaint seeks, among other things, unspecified monetary damages, reasonable costs and expenses and/or other relief as deemed appropriate by the Court. Defendants have not yet responded to the complaint.

On August 27, 2025, the Company, John Adent, Steven J. Quinlan, James C. Borel, William T. Boehm, Ronald D. Green, Ralph A. Rodriguez, James P. Tobin, Darci L. Vetter, and Catherine E. Woteki were named in a putative class action filed in Minnesota’s Second Judicial District for Ramsey County. The complaint asserts claims under Sections 11, 12(a)(2), and 15 of the Securities Act of 1933 based on allegedly false and misleading public statements by defendants in the offering materials issued in connection with the 2022 transaction in which Neogen acquired 3M’s Food Safety Business. The complaint seeks, among other things, unspecified monetary damages, reasonable costs and expenses, recission, and/or such other equitable or injunctive relief as deemed appropriate by the Court. Defendants have not yet responded to the complaint.

Stockholder Demands

On August 13 and August 15, 2025, the Company received two separate stockholder litigation demands requesting that the Board investigate the allegations in the Federal Action and pursue claims on the Company’s behalf based on those allegations. On October 4, 2025, the Board established a litigation committee to consider and investigate the demands.

The Company intends to vigorously defend the matters. Given the uncertainty of litigation and the preliminary stage of the cases, we cannot estimate the reasonably possible loss or range of loss that may result from the actions.

Other than the shareholder items noted above, we are subject to certain legal and other proceedings that, in the opinion of management, are not expected to have a material effect on our financial statements.