Description of Business and Basis of Presentation (Policies)	3 Months Ended
Aug. 31, 2025
Basis of Presentation and Consolidation	BASIS OF PRESENTATION AND CONSOLIDATION The accompanying unaudited condensed consolidated financial statements include the accounts of Neogen and its wholly owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (generally accepted accounting principles) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In our opinion, all adjustments considered necessary for a fair statement of the results of the interim period have been included in the accompanying unaudited condensed consolidated financial statements. All intercompany balances and transactions have been eliminated in consolidation. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended May 31, 2025.
New Accounting Pronouncements Adopted	New Accounting Pronouncements Adopted Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which modifies the disclosure and presentation requirements of reportable segments. The amendments in the update require the disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (CODM) and included within each reported measure of segment profit and loss. The amendments also require disclosure of all other segment items by reportable segment and a description of its composition. Additionally, the amendments require disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. We adopted this pronouncement and provided required interim disclosures in Note 5 "Segment Information and Geographic Data" to the condensed consolidated financial statements. We adopted the interim requirements on June 1, 2025. Income Taxes (Topic 740): Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands disclosures in an entity’s income tax rate reconciliation table and disclosures regarding cash taxes paid both in the U.S. and foreign jurisdictions. This guidance becomes effective for our fiscal year 2026 annual reporting. We adopted this guidance on June 1, 2025 and the adoption of this guidance will result in modifications to Neogen's income tax disclosures to adhere to the new requirements, but is not expected to otherwise have a significant impact on our consolidated financial statements.
New Accounting Pronouncements Not Yet Adopted	New Accounting Pronouncements Not Yet Adopted Income Statement (Topic 220): Expense Disaggregation Disclosures In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures, which requires a public business entity to provide disaggregated disclosures, in the notes to the financial statements, of certain categories of expenses that are included in expense line items on the face of the income statement. The amendments in this Update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. We are currently evaluating the impact that the new guidance will have on the presentation of our consolidated financial statements and accompanying notes. Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets In July 2025, the FASB issued ASU 2025-05, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. The amendments provide a practical expedient and, if applicable, an accounting policy election to simplify the measurement of credit losses for certain receivables and contract assets. The amendments are effective for annual reporting periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. Early adoption is permitted in any interim or annual period in which financial statements have not yet been issued or made available for issuance. We are currently evaluating the impact of this amendment and do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and accompanying notes.

Description of Business and Basis of Presentation (Policies)

3 Months Ended

Aug. 31, 2025

BASIS OF PRESENTATION AND CONSOLIDATION

The accompanying unaudited condensed consolidated financial statements include the accounts of Neogen and its wholly owned subsidiaries and have been prepared in accordance with accounting principles generally accepted in the United States of America (generally accepted accounting principles) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

In our opinion, all adjustments considered necessary for a fair statement of the results of the interim period have been included in the accompanying unaudited condensed consolidated financial statements. All intercompany balances and transactions have been eliminated in consolidation. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the fiscal year ended May 31, 2025.

New Accounting Pronouncements Adopted

Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures

In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which modifies the disclosure and presentation requirements of reportable segments. The amendments in the update require the disclosure of significant segment expenses that are regularly provided to the chief operating decision maker (CODM) and included within each reported measure of segment profit and loss. The amendments also require disclosure of all other segment items by reportable segment and a description of its composition. Additionally, the amendments require disclosure of the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. We adopted this pronouncement and provided required interim disclosures in Note 5 "Segment Information and Geographic Data" to the condensed consolidated financial statements. We adopted the interim requirements on June 1, 2025.

Income Taxes (Topic 740): Improvements to Income Tax Disclosures

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which expands disclosures in an entity’s income tax rate reconciliation table and disclosures regarding cash taxes paid both in the U.S. and foreign jurisdictions. This guidance becomes effective for our fiscal year 2026 annual reporting. We adopted this guidance on June 1, 2025 and the adoption of this guidance will result in modifications to Neogen's income tax disclosures to adhere to the new requirements, but is not expected to otherwise have a significant impact on our consolidated financial statements.

New Accounting Pronouncements Not Yet Adopted

Income Statement (Topic 220): Expense Disaggregation Disclosures

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures, which requires a public business entity to provide disaggregated disclosures, in the notes to the financial statements, of certain categories of expenses that are included in expense line items on the face of the income statement. The amendments in this Update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. We are currently evaluating the impact that the new guidance will have on the presentation of our consolidated financial statements and accompanying notes.

Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets

In July 2025, the FASB issued ASU 2025-05, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets. The amendments provide a practical expedient and, if applicable, an accounting policy election to simplify the measurement of credit losses for certain receivables and contract assets. The amendments are effective for annual reporting periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. Early adoption is permitted in any interim or annual period in which financial statements have not yet been issued or made available for issuance. We are currently evaluating the impact of this amendment and do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and accompanying notes.