Description of Business and Basis of Presentation	3 Months Ended
Aug. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION DESCRIPTION OF BUSINESS Neogen Corporation and subsidiaries ("Neogen," "we," "our" or the "Company") develop, manufacture and market a diverse line of products and services dedicated to food and animal safety. Our Food Safety segment consists primarily of diagnostic test kits and complementary products (e.g., culture media) sold to food producers and processors to detect dangerous and/or unintended substances in human food and animal feed, such as foodborne pathogens, spoilage organisms, natural toxins, food allergens, genetic modifications, ruminant by-products, meat speciation, drug residues, pesticide residues and general sanitation concerns. Our line of food safety products also includes advanced software systems that help testers objectively analyze and store, as well as perform analysis on their results from multiple locations over extended periods. Neogen’s Animal Safety segment is engaged in the development, manufacture, marketing and distribution of veterinary instruments, pharmaceuticals, vaccines, topicals, parasiticides, diagnostic products, rodent control products, insect control products and genomics testing services for the worldwide animal safety market. The majority of these consumable products are marketed through veterinarians, retailers, livestock producers and animal health product distributors. Our line of drug detection products is sold worldwide for the detection of abused and therapeutic drugs in animals and animal products, and has expanded into the workplace testing and human forensic markets. In July 2025, the Company divested its global Cleaners and Disinfectants business. See Note 3 "Assets Held for Sale and Divestiture" to the condensed consolidated financial statements for further discussion. 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, 2026. 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. Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities, which defines government grants and establishes recognition, measurement and presentation guidance for government grants received by business entities, including a grant related to an asset and a grant related to income. The amendments in the update require that received government grants should not be recognized until it is probable that a business entity will comply with the conditions of the grant, the grant will be received and the business entity meets the recognition guidance for a grant related to an asset or a grant related to income. The amendments in this update are effective for interim and annual periods beginning after December 15, 2028, with early adoption permitted. The Company is evaluating the potential impact of the new requirements.

Neogen Corporation and subsidiaries ("Neogen," "we," "our" or the "Company") develop, manufacture and market a diverse line of products and services dedicated to food and animal safety. Our Food Safety segment consists primarily of diagnostic test kits and complementary products (e.g., culture media) sold to food producers and processors to detect dangerous and/or unintended substances in human food and animal feed, such as foodborne pathogens, spoilage organisms, natural toxins, food allergens, genetic modifications, ruminant by-products, meat speciation, drug residues, pesticide residues and general sanitation concerns. Our line of food safety products also includes advanced software systems that help testers objectively analyze and store, as well as perform analysis on their results from multiple locations over extended periods.

Neogen’s Animal Safety segment is engaged in the development, manufacture, marketing and distribution of veterinary instruments, pharmaceuticals, vaccines, topicals, parasiticides, diagnostic products, rodent control products, insect control products and genomics testing services for the worldwide animal safety market. The majority of these consumable products are marketed through veterinarians, retailers, livestock producers and animal health product distributors. Our line of drug detection products is sold worldwide for the detection of abused and therapeutic drugs in animals and animal products, and has expanded into the workplace testing and human forensic markets. In July 2025, the Company divested its global Cleaners and Disinfectants business. See Note 3 "Assets Held for Sale and Divestiture" to the condensed consolidated financial statements for further discussion.

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, 2026.

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.

Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities

In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities, which defines government grants and establishes recognition, measurement and presentation guidance for government grants received by business entities, including a grant related to an asset and a grant related to income. The amendments in the update require that received government grants should not be recognized until it is probable that a business entity will comply with the conditions of the grant, the grant will be received and the business entity meets the recognition guidance for a grant related to an asset or a grant related to