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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
May 31, 2016
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 72,245 $ 65,036  
Service revenues to external customers 11,400 9,824  
Total revenues to external customers 83,645 74,860  
Operating income (loss) 14,742 14,895  
Total assets 468,615 409,386 $ 451,715
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 35,642 32,051  
Service revenues to external customers 3,361 2,408  
Total revenues to external customers 39,003 34,459  
Operating income (loss) 8,083 8,421  
Total assets 142,339 132,115  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 36,603 32,985  
Service revenues to external customers 8,039 7,416  
Total revenues to external customers 44,642 40,401  
Operating income (loss) 7,696 7,340  
Total assets 211,827 179,453  
Corporate and Eliminations      
Segment Reporting Information [Line Items]      
Product revenues to external customers [1] 0 0  
Service revenues to external customers [1] 0 0  
Total revenues to external customers [1] 0 0  
Operating income (loss) [1] (1,037) (866)  
Total assets [1] $ 114,449 $ 97,818  
[1] Includes corporate assets, consisting principally of cash and cash equivalents, marketable securities, current and deferred tax accounts and overhead expenses not allocated to specific business segments. Also includes the elimination of intersegment transactions.