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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
May 31, 2013
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 54,623 $ 44,124 $ 159,198 $ 135,429  
Service revenues to external customers 7,373 6,931 20,945 16,093  
Total revenues to external customers 61,996 51,055 180,143 151,522  
Operating income (loss) 10,293 9,666 32,400 30,470  
Total assets 330,350 281,025 330,350 281,025 290,558
Operating Segments | Food Safety
          
Segment Reporting Information [Line Items]          
Product revenues to external customers 26,627 24,152 82,761 75,278  
Service revenues to external customers 1,393 1,159 3,656 2,259  
Total revenues to external customers 28,020 25,311 86,417 77,537  
Operating income (loss) 5,969 5,668 20,956 20,450  
Total assets 110,038 90,953 110,038 90,953  
Operating Segments | Animal Safety
          
Segment Reporting Information [Line Items]          
Product revenues to external customers 27,996 19,972 76,437 60,151  
Service revenues to external customers 5,980 5,772 17,289 13,834  
Total revenues to external customers 33,976 25,744 93,726 73,985  
Operating income (loss) 5,169 4,679 13,746 11,868  
Total assets 149,202 124,899 149,202 124,899  
Corporate Eliminations
          
Segment Reporting Information [Line Items]          
Product revenues to external customers 0 [1] 0 [1] 0 [1] 0 [1]  
Service revenues to external customers 0 [1] 0 [1] 0 [1] 0 [1]  
Total revenues to external customers 0 [1] 0 [1] 0 [1] 0 [1]  
Operating income (loss) (845) [1] (681) [1] (2,302) [1] (1,848) [1]  
Total assets $ 71,110 [1] $ 65,173 [1] $ 71,110 [1] $ 65,173 [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.