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Summary of Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
May 31, 2013
May 31, 2012
May 31, 2011
May 31, 2010
Significant Accounting Policies [Line Items]        
Account receivable from major customer $ 38,737,000 $ 35,652,000    
Cash and cash equivalents 50,032,000 49,045,000 35,844,000 22,806,000
Short-term domestic certificates of deposit 13,348,000      
Commercial Paper 21,989,000      
Marketable securities 35,337,000 19,600,000    
Valuation allowance for inventory 1,250,000 1,100,000    
Depreciation expense 4,417,000 3,646,000 3,185,000  
Weighted-average fair value per share of stock options granted $ 13.81 $ 10.41 $ 8.66  
Shipping and handling costs 6,856,000 5,940,000 5,211,000  
Unremitted earnings of foreign subsidiaries 13,419,000      
Advertising costs 1,055,000 1,001,000 677,000  
Options excluded from computation of net income per share 0 52,300 12,000  
Minimum
        
Significant Accounting Policies [Line Items]        
Marketable securities, maturity period 91 days      
Amortizable intangible assets amortization period 5 years      
Maximum
        
Significant Accounting Policies [Line Items]        
Marketable securities, maturity period 1 year      
Amortizable intangible assets amortization period 20 years      
Customer Relationships
        
Significant Accounting Policies [Line Items]        
Amortizable intangible assets amortization period 12 years 12 years    
Customer Relationships | Minimum
        
Significant Accounting Policies [Line Items]        
Amortizable intangible assets amortization period 12 years      
Customer Relationships | Maximum
        
Significant Accounting Policies [Line Items]        
Amortizable intangible assets amortization period 20 years      
Other Intangible Assets
        
Significant Accounting Policies [Line Items]        
Amortizable intangible assets amortization period 13 years 13 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  
Neogen Latin America
        
Significant Accounting Policies [Line Items]        
Percentage of ownership in subsidiaries 60.00%      
Neogen Do Brazil
        
Significant Accounting Policies [Line Items]        
Percentage of ownership in subsidiaries 92.00%      
Customer one
        
Significant Accounting Policies [Line Items]        
Account receivable from major customer $ 3,785,000      
Account receivable percentage from major customer 10.00%