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Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
May 31, 2013
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 53,228 $ 46,492 $ 104,575 $ 91,306  
Service revenues to external customers 6,371 4,245 13,572 9,161  
Total revenues to external customers 59,599 50,737 118,147 100,467  
Operating income (loss) 9,689 10,477 22,107 20,805  
Total assets 319,713 269,671 319,713 269,671 290,558
Food Safety
          
Segment Reporting Information [Line Items]          
Product revenues to external customers 27,578 25,344 56,135 51,127  
Service revenues to external customers 821 686 2,263 1,098  
Total revenues to external customers 28,399 26,030 58,398 52,225  
Operating income (loss) 6,286 7,112 14,987 14,781  
Total assets 100,172 88,755 100,172 88,755  
Animal Safety
          
Segment Reporting Information [Line Items]          
Product revenues to external customers 25,650 21,148 48,440 40,179  
Service revenues to external customers 5,550 3,559 11,309 8,063  
Total revenues to external customers 31,200 24,707 59,749 48,242  
Operating income (loss) 4,157 3,946 8,577 7,189  
Total assets 150,943 119,471 150,943 119,471  
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) (754) [1] (581) [1] (1,457) [1] (1,165) [1]  
Total assets $ 68,598 [1] $ 61,445 [1] $ 68,598 [1] $ 61,445 [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.