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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
May. 31, 2015
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 65,036 $ 58,224  
Service revenues to external customers 9,824 9,375  
Total revenues to external customers 74,860 67,599  
Operating income (loss) 14,895 13,439  
Total assets 409,386 357,662 $ 392,181
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 32,051 28,062  
Service revenues to external customers 2,408 2,901  
Total revenues to external customers 34,459 30,963  
Operating income (loss) 8,421 7,515  
Total assets 132,115 103,637  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 32,985 30,162  
Service revenues to external customers 7,416 6,474  
Total revenues to external customers 40,401 36,636  
Operating income (loss) 7,340 6,705  
Total assets 179,453 176,419  
Corporate and Eliminations      
Segment Reporting Information [Line Items]      
Product revenues to external customers [1]   0  
Service revenues to external customers [1] 0 0  
Total revenues to external customers [1] 0 0  
Operating income (loss) [1] (866) (781)  
Total assets [1] $ 97,818 $ 77,606  
[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.