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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 29, 2017 | Dec. 22, 2017 | Feb. 28, 2017 | May 31, 2018 USD ($) $ / shares shares | May 31, 2017 USD ($) $ / shares shares | May 31, 2016 USD ($) $ / shares shares | May 31, 2015 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Stock split ratio | 1.33 |  |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 83,074,000 | $ 77,567,000 | $ 55,257,000 | $ 66,061,000
Cash held at foreign subsidiaries |  |  |  | 7,101,000 | 8,132,000 |  |
Short-term domestic certificates of deposit |  |  |  | 27,400,000 |  |  |
Commercial Paper |  |  |  | 100,336,000 |  |  |
Marketable securities |  |  |  | 127,736,000 | 66,068,000 |  |
Valuation allowance for inventory |  |  |  | 2,200,000 | 2,000,000 |  |
Depreciation expense |  |  |  | $ 10,315,000 | $ 8,783,000 | $ 7,452,000 |
Finite lived intangible assets, useful life |  |  |  | 11 years | 11 years |  |
Weighted-average fair value per share of stock options granted | $ / shares |  |  |  | $ 14.47 | $ 11.89 | $ 9.83 |
Percentage of customer credits for sales returns, pricing and other disputes, and other related matters against net revenue |  |  |  | 3.00% | 3.00% | 3.00% |
Cost of goods and services sold |  |  |  | $ 212,000,000 | $ 189,626,000 | $ 168,211,000 |
Unremitted earnings of foreign subsidiaries |  |  |  | $ 43,784,000 |  |  |
Federal corporate tax rate |  | 35.00% |  | 21.00% |  |  |
Deferred tax benefit |  |  |  | $ (6,022,000) |  |  |
Current tax expense |  |  |  | $ 1,223,000 |  |  |
Shares excluded from computations of diluted net income per share | shares |  |  |  | 0 | 0 | 0 |
ASU No. 2016-09 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in income tax expense |  |  |  | $ 4,816,000 |  |  |
Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Marketable securities, maturity period |  |  |  | 91 days |  |  |
Finite lived intangible assets, useful life |  |  |  | 5 years |  |  |
Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Marketable securities, maturity period |  |  |  | 1 year |  |  |
Finite lived intangible assets, useful life |  |  |  | 25 years |  |  |
Buildings And Improvements | Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment estimated useful life |  |  |  | 7 years | 7 years | 7 years |
Buildings And Improvements | Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment estimated useful life |  |  |  | 39 years | 39 years | 39 years |
Furniture, Machinery and Equipment | Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment estimated useful life |  |  |  | 3 years | 3 years | 3 years |
Furniture, Machinery and Equipment | Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment estimated useful life |  |  |  | 10 years | 10 years | 10 years |
Shipping and Handling |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  | $ 12,147,000 | $ 10,185,000 | $ 9,734,000 |
Advertising Cost |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cost of goods and services sold |  |  |  | $ 1,699,000 | $ 1,643,000 | $ 1,463,000 |
Neogen Do Brazil |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of ownership in subsidiaries |  |  |  | 100.00% | 90.00% |  |
Percentage of ownership in subsidiaries after capital contribution |  |  | 100.00% | 100.00% | 100.00% |  |
Neogen Latin America |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of ownership in subsidiaries |  |  | 10.00% | 100.00% | 100.00% |  |
Customer one |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Account receivable percentage from major customer |  |  |  | 10.00% | 10.00% |  |

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