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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
0 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Oct. 30, 2013
May 31, 2014
May 31, 2013
May 31, 2012
May 31, 2011
May 31, 2014
Minimum
May 31, 2014
Maximum
May 31, 2014
Buildings And Improvements
Minimum
May 31, 2013
Buildings And Improvements
Minimum
May 31, 2012
Buildings And Improvements
Minimum
May 31, 2014
Buildings And Improvements
Maximum
May 31, 2013
Buildings And Improvements
Maximum
May 31, 2012
Buildings And Improvements
Maximum
May 31, 2014
Furniture, Machinery and Equipment
Minimum
May 31, 2013
Furniture, Machinery and Equipment
Minimum
May 31, 2012
Furniture, Machinery and Equipment
Minimum
May 31, 2014
Furniture, Machinery and Equipment
Maximum
May 31, 2013
Furniture, Machinery and Equipment
Maximum
May 31, 2012
Furniture, Machinery and Equipment
Maximum
May 31, 2014
Customer Relationships
May 31, 2013
Customer Relationships
May 31, 2014
Customer Relationships
Minimum
May 31, 2014
Customer Relationships
Maximum
May 31, 2014
Other Intangible Assets
May 31, 2013
Other Intangible Assets
Dec. 31, 2013
Neogen Latin America
May 31, 2014
Neogen Latin America
May 31, 2014
Neogen Do Brazil
May 31, 2014
Customer one
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%      
Stock Split ratio 1.5                                                        
Account receivable percentage from major customer                                                         10.00%
Cash and cash equivalents   $ 40,675,000 $ 50,032,000 $ 49,045,000 $ 35,844,000                                                
Short-term domestic certificates of deposit   17,576,000                                                      
Marketable securities, maturity period           91 days 1 year                                            
Commercial Paper   18,245,000                                                      
Marketable securities   35,821,000 35,337,000                                                    
Valuation allowance for inventory   1,425,000 1,250,000                                                    
Property, plant and equipment estimated useful life               7 years 7 years 7 years 39 years 39 years 39 years 3 years 3 years 3 years 10 years 10 years 10 years                    
Depreciation expense   5,383,000 4,417,000 3,646,000                                                  
Finite lived intangible assets, useful life           5 years 20 years                         12 years 12 years 12 years 20 years 12 years 12 years        
Weighted-average fair value per share of stock options granted   $ 9.87 $ 9.21 $ 6.94                                                  
Shipping and handling costs   7,472,000 6,856,000 5,940,000                                                  
Unremitted earnings of foreign subsidiaries   18,262,000                                                      
Advertising costs   $ 1,344,000 $ 1,055,000 $ 1,001,000                                                  
Shares excluded from computations of diluted net income per share   48,716 88,912 78,450