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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%