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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 31, 2013
Aug. 31, 2012
May 31, 2013
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 51,346 $ 44,813  
Service revenues to external customers 7,202 4,916  
Total revenues to external customers 58,548 49,729  
Operating income (loss) 12,418 10,328  
Total assets 308,137 260,797 290,558
Food Safety
      
Segment Reporting Information [Line Items]      
Product revenues to external customers 28,554 25,782  
Service revenues to external customers 1,444 413  
Total revenues to external customers 29,998 26,195  
Operating income (loss) 8,701 7,669  
Total assets 98,062 89,170  
Animal Safety
      
Segment Reporting Information [Line Items]      
Product revenues to external customers 22,792 19,031  
Service revenues to external customers 5,758 4,503  
Total revenues to external customers 28,550 23,534  
Operating income (loss) 4,420 3,243  
Total assets 136,687 105,769  
Corporate Eliminations
      
Segment Reporting Information [Line Items]      
Product revenues to external customers 0 [1] 0 [1]  
Service revenues to external customers 0 [1] 0 [1]  
Total revenues to external customers 0 [1] 0 [1]  
Operating income (loss) (703) [1] (584) [1]  
Total assets $ 73,388 [1] $ 65,858 [1]  
[1] Includes corporate assets, consisting principally of cash and cash equivalents, marketable securities, deferred assets and overhead expenses not allocated to specific business segments. Also includes the elimination of intersegment transactions.