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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 28, 2017 | May 31, 2016 | Dec. 31, 2013 | May 31, 2017 | May 31, 2016 | May 31, 2015 | May 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 55,257,000 |  | $ 77,567,000 | $ 55,257,000 | $ 66,061,000 | $ 40,675,000
Cash held at foreign subsidiaries |  | 5,320,000 |  | 8,132,000 | 5,320,000 |  |
Short-term domestic certificates of deposit |  |  |  | 25,355,000 |  |  |
Commercial Paper |  |  |  | 40,713,000 |  |  |
Marketable securities |  | 52,539,000 |  | 66,068,000 | 52,539,000 |  |
Valuation allowance for inventory |  | 1,550,000 |  | 2,000,000 | 1,550,000 |  |
Depreciation expense |  |  |  | $ 8,783,000 | $ 7,452,000 | $ 6,318,000 |
Weighted-average fair value per share of stock options granted |  |  |  | $ 15.86 | $ 13.11 | $ 11.91 |
Percentage of customer credits for sales returns, pricing and other disputes, and other related matters against net revenue |  |  |  | 3.00% | 3.00% | 3.00% |
Shipping and handling costs |  |  |  | $ 10,185,000 | $ 9,734,000 | $ 8,648,000 |
Unremitted earnings of foreign subsidiaries |  |  |  | 35,281,000 |  |  |
Advertising costs |  |  |  | $ 1,643,000 | $ 1,463,000 | $ 1,371,000 |
Shares excluded from computations of diluted net income per share |  |  |  | 0 | 0 | 0 |
Deferred tax assets, Current |  | 1,775,000 |  |  | $ 1,775,000 |  |
Total assets and total liabilities decreased due to early adoption of ASU 2015-17 |  | $ 1,775,000 |  |  |  |  |
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 |
Customer Relationships |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 11 years | 12 years |  |
Other Intangible Assets |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 11 years | 12 years |  |
Neogen Latin America |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of ownership in subsidiaries |  | 90.00% |  | 90.00% | 90.00% |  |
Percentage of ownership in subsidiaries before capital contribution |  |  | 60.00% |  |  |  |
Percentage of ownership in subsidiaries after capital contribution |  |  | 90.00% |  |  |  |
Neogen Do Brazil |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of ownership in subsidiaries |  | 90.00% |  | 100.00% | 90.00% |  |
Percentage of ownership in subsidiaries after capital contribution | 100.00% |  |  |  |  |  |
Customer one |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Account receivable percentage from major customer |  |  |  | 10.00% | 10.00% |  |

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