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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 22, 2017 | Dec. 29, 2017 | May 31, 2019 USD ($) $ / shares shares | May 31, 2018 USD ($) $ / shares shares | May 31, 2017 USD ($) $ / shares shares | Feb. 28, 2017 | May 31, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Stock split ratio |  |  | 1.33 |  |  |  |  |
Marketable securities, maturity period |  |  |  | 2 years |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 10 years | 11 years |  |  |
Federal corporate tax rate |  | 35.00% |  | 21.00% | 21.00% |  |  |
Commercial Paper |  |  |  | $ 208,155,000 |  |  |  |
Short-term domestic certificates of deposit |  |  |  | 17,681,000 |  |  |  |
Marketable securities |  |  |  | 225,836,000 | $ 127,736,000 |  |  |
Valuation allowance for inventory |  |  |  | 2,250,000 | 2,200,000 |  |  |
Depreciation expense |  |  |  | 11,315,000 | 10,315,000 | $ 8,783,000 |  |
Cost of goods and services sold |  |  |  | 222,266,000 | $ 211,658,000 | $ 189,353,000 |  |
Unremitted earnings of foreign subsidiaries |  |  |  | $ 55,553,000 |  |  |  |
Weighted-average fair value per share of stock options granted | $ / shares |  |  |  | $ 14.91 | $ 14.47 | $ 11.89 |  |
Cash held at foreign subsidiaries |  |  |  | $ 8,711,000 | $ 7,101,000 |  |  |
Cash and cash equivalents |  |  |  | $ 41,688,000 | $ 83,074,000 | $ 77,567,000 |  | $ 55,257,000
Shares excluded from computations of diluted net income per share | shares |  |  |  | 0 | 0 | 0 |  |
Shipping and Handling |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  | $ 13,503,000 | $ 12,147,000 | $ 10,185,000 |  |
Advertising Cost |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  | $ 1,471,000 | $ 1,411,000 | $ 1,426,000 |  |
Customer One |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Account receivable percentage from major customer |  |  |  | 10.00% | 10.00% |  |  |
Neogen Do Brazil |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership in subsidiaries |  |  |  |  |  |  | 10.00% |
Latin America |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership in subsidiaries |  |  |  | 100.00% | 100.00% |  |  |
Percentage of ownership in subsidiaries before capital contribution | 90.00% |  |  |  |  |  |  |
Percentage of ownership in subsidiaries Before capital contribution | 100.00% |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Marketable securities, maturity period |  |  |  | 91 days |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 5 years |  |  |  |
Minimum | Buildings And Improvements |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 7 years | 7 years | 7 years |  |
Minimum | Furniture, fixtures, machinery and equipment |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 25 years |  |  |  |
Maximum | Buildings And Improvements |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 39 years | 39 years | 39 years |  |
Maximum | Furniture, fixtures, machinery and equipment |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  | 10 years |  |  |  |

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