Cover Page - USD ($) |
12 Months Ended | ||
|---|---|---|---|
May 31, 2025 |
Jun. 30, 2025 |
Nov. 30, 2024 |
|
| Cover [Abstract] | |||
| Document Type | 10-K | ||
| Amendment Flag | false | ||
| Document Period End Date | May 31, 2025 | ||
| Document Fiscal Year Focus | 2025 | ||
| Document Fiscal Period Focus | FY | ||
| Current Fiscal Year End Date | --05-31 | ||
| Entity Interactive Data Current | Yes | ||
| Entity Current Reporting Status | Yes | ||
| Entity Registrant Name | NEOGEN CORPORATION | ||
| Entity Central Index Key | 0000711377 | ||
| Trading Symbol | NEOG | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Small Business | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Entity Public Float | $ 2,716,620,906 | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Common Stock, Shares Outstanding | 217,205,186 | ||
| Entity File Number | 0-17988 | ||
| Title of 12(g) Security | Common Stock, $0.16 par value per share | ||
| Security Exchange Name | NASDAQ | ||
| Entity Incorporation, State or Country Code | MI | ||
| Entity Tax Identification Number | 38-2367843 | ||
| Entity Address, Address Line One | 620 Lesher Place | ||
| Entity Address, State or Province | MI | ||
| Local Phone Number | 372-9200 | ||
| Entity Address, City or Town | Lansing | ||
| City Area Code | 517 | ||
| Entity Address, Postal Zip Code | 48912 | ||
| ICFR Auditor Attestation Flag | true | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Auditor Name | BDO USA, P.C. | ||
| Auditor Firm ID | 243 | ||
| Auditor Location | Grand Rapids, MI | ||
| Documents Incorporated by Reference [Text Block] | DOCUMENTS INCORPORATED BY REFERENCE Certain portions of the registrant’s definitive proxy statement to be prepared pursuant to Regulation 14a and filed in connection with solicitation of proxies for its October 23, 2025 annual meeting of shareholders are incorporated by reference into part III of the Form 10-K. |
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| Auditor Opinion [Text Block] | Opinion on the Consolidated Financial Statements We have audited the accompanying consolidated balance sheets of Neogen Corporation (the “Company”) as of May 31, 2025 and 2024, the related consolidated statements of operations, comprehensive (loss) income, stockholders’ equity, and cash flows for each of the three years in the period ended May 31, 2025, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at May 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended May 31, 2025, in conformity with accounting principles generally accepted in the United States of America. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of May 31, 2025, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) and our report dated July 30, 2025 expressed an adverse opinion thereon. |