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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2013 | Oct. 30, 2013 | May. 31, 2015 USD ($) $ / shares shares | May. 31, 2014 USD ($) $ / shares shares | May. 31, 2013 USD ($) $ / shares shares | May. 31, 2012 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock Split ratio |  | 1.5 |  |  |  |
Cash and cash equivalents |  |  | $ 66,061,000 | $ 40,675,000 | $ 50,032,000 | $ 49,045,000
Cash held at foreign subsidiaries |  |  | 13,277,000 | 10,234,000 |  |
Short-term domestic certificates of deposit |  |  | 26,109,000 |  |  |
Commercial Paper |  |  | 21,994,000 |  |  |
Marketable securities |  |  | 48,103,000 | 35,821,000 |  |
Valuation allowance for inventory |  |  | 1,550,000 | 1,425,000 |  |
Depreciation expense |  |  | $ 6,318,000 | $ 5,383,000 | $ 4,417,000 |
Weighted-average fair value per share of stock options granted | $ / shares |  |  | $ 11.91 | $ 9.87 | $ 9.21 |
Percentage of customer credits for sales returns, pricing and other disputes, and other related matters against net revenue |  |  | 3.00% |  |  |
Shipping and handling costs |  |  | $ 8,648,000 | $ 7,497,000 | $ 6,856,000 |
Unremitted earnings of foreign subsidiaries |  |  | 24,423,000 |  |  |
Advertising costs |  |  | $ 1,371,000 | $ 1,344,000 | $ 1,055,000 |
Shares excluded from computations of diluted net income per share | shares |  |  | 0 | 48,716 | 88,912 |
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 |  |  | 12 years | 12 years |  |
Customer Relationships | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  | 10 years |  |  |
Customer Relationships | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  | 20 years |  |  |
Other Intangible Assets |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  | 12 years | 12 years |  |
Neogen Latin America |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of ownership in subsidiaries |  |  | 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% | 90.00% |  |
Customer one |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Account receivable percentage from major customer |  |  | 10.00% |  |  |

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