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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
May 31, 2012
Segment Reporting Information [Line Items]          
Net sales to external customers $ 50,737 $ 44,891 $ 100,467 $ 90,588  
Operating income (reduction) 10,477 8,143 20,805 17,494  
Total assets 269,671 234,318 269,671 234,318 251,600
Food Safety
          
Segment Reporting Information [Line Items]          
Net sales to external customers 26,030 22,042 52,225 45,324  
Operating income (reduction) 7,112 5,679 14,781 12,843  
Total assets 88,755 84,719 88,755 84,719  
Animal Safety
          
Segment Reporting Information [Line Items]          
Net sales to external customers 24,707 22,849 48,242 45,264  
Operating income (reduction) 3,946 2,933 7,189 5,676  
Total assets 119,471 101,341 119,471 101,341  
Corporate Eliminations
          
Segment Reporting Information [Line Items]          
Net sales to external customers 0 [1] 0 [1] 0 [1] 0 [1]  
Operating income (reduction) (581) [1] (469) [1] (1,165) [1] (1,025) [1]  
Total assets $ 61,445 [1] $ 48,258 [1] $ 61,445 [1] $ 48,258 [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.