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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Aug. 31, 2014
Aug. 31, 2013
May 31, 2014
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 59,255 $ 51,346  
Service revenues to external customers 8,344 7,202  
Total revenues to external customers 67,599 58,548  
Operating income (loss) 13,439 12,418  
Total assets 357,662 308,137 345,301
Operating Segments | Food Safety
      
Segment Reporting Information [Line Items]      
Product revenues to external customers 29,093 28,554  
Service revenues to external customers 1,870 1,444  
Total revenues to external customers 30,963 29,998  
Operating income (loss) 7,515 8,701  
Total assets 103,637 98,062  
Operating Segments | Animal Safety
      
Segment Reporting Information [Line Items]      
Product revenues to external customers 30,162 22,792  
Service revenues to external customers 6,474 5,758  
Total revenues to external customers 36,636 28,550  
Operating income (loss) 6,705 4,420  
Total assets 176,419 136,687  
Corporate and Eliminations
      
Segment Reporting Information [Line Items]      
Product revenues to external customers   0 [1]  
Service revenues to external customers 0 [1] 0 [1]  
Total revenues to external customers 0 [1] 0 [1]  
Operating income (loss) (781) [1] (703) [1]  
Total assets $ 77,606 [1] $ 73,388 [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.