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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
May 31, 2012
Segment Reporting Information [Line Items]          
Net sales to external customers $ 51,055 $ 44,912 $ 151,522 $ 135,501  
Operating income (reduction) 9,666 7,549 30,470 25,042  
Total assets 281,025 240,347 281,025 240,347 251,600
Food Safety
          
Segment Reporting Information [Line Items]          
Net sales to external customers 25,311 21,923 77,537 67,247  
Operating income (reduction) 5,668 5,119 20,450 17,961  
Total assets 90,953 83,053 90,953 83,053  
Animal Safety
          
Segment Reporting Information [Line Items]          
Net sales to external customers 25,744 22,989 73,985 68,254  
Operating income (reduction) 4,679 3,174 11,868 8,851  
Total assets 124,899 103,262 124,899 103,262  
Corporate Eliminations
          
Segment Reporting Information [Line Items]          
Net sales to external customers 0 [1] 0 [1] 0 [1] 0 [1]  
Operating income (reduction) (681) [1] (744) [1] (1,848) [1] (1,770) [1]  
Total assets $ 65,173 [1] $ 54,032 [1] $ 65,173 [1] $ 54,032 [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.