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Description of Business and Basis of Presentation - Additional Information (Detail) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 01, 2022 shares | Feb. 29, 2024 USD ($) Segment | May 31, 2023 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Right of use assets |  | $ 15,301,000 | $ 11,933,000
Lease liabilities |  | 15,771,000 | 12,089,000
Finance lease assets |  | $ 2,496,000 | $ 0
Number of operating segments | Segment |  | 2 |
Number Of Days Determined On Fair Value Of Assets And Liabilities From The Acquisition Date |  | 12 months |
Customer One |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration Risk Receivables Single Customer Percentage |  | 10.00% | 10.00%
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Useful Life in Years |  | 2 years |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Useful Life in Years |  | 25 years |
Three M Food Safety Transaction [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Number of shares issued in business acquisitions | shares | 108,269,946 |  |
Three M Food Safety Transaction [Member] | Premerger Neogen Shareholders [Member] | Postmerger Neogen Corp [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Minority interest ownership percentage by Noncontrolling owners | 49.90% |  |

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