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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2013
Oct. 30, 2013
May 31, 2016
USD ($)
$ / shares
shares
May 31, 2015
USD ($)
$ / shares
shares
May 31, 2014
USD ($)
$ / shares
shares
May 31, 2013
USD ($)
Significant Accounting Policies [Line Items]            
Stock Split ratio   1.5        
Cash and cash equivalents     $ 55,257,000 $ 66,061,000 $ 40,675,000 $ 50,032,000
Cash held at foreign subsidiaries     5,320,000 13,277,000    
Short-term domestic certificates of deposit     25,873,000      
Commercial Paper     26,666,000      
Marketable securities     52,539,000 48,103,000    
Valuation allowance for inventory     1,550,000 1,550,000    
Depreciation expense     $ 7,452,000 $ 6,318,000 $ 5,383,000  
Weighted-average fair value per share of stock options granted | $ / shares     $ 13.11 $ 11.91 $ 9.87  
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     $ 9,734,000 $ 8,648,000 $ 7,497,000  
Unremitted earnings of foreign subsidiaries     27,880,000      
Advertising costs     $ 1,463,000 $ 1,371,000 $ 1,344,000  
Shares excluded from computations of diluted net income per share | shares     0 0 48,716  
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    
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% 10.00%