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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
May. 31, 2015
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 64,377 $ 58,066 $ 198,131 $ 176,114  
Service revenues to external customers 12,348 10,343 33,065 28,349  
Total revenues to external customers 76,725 68,409 231,196 204,463  
Operating income (loss) 11,254 12,160 40,761 38,496  
Total assets 432,241 378,435 432,241 378,435 $ 392,181
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 31,975 29,348 98,708 87,761  
Service revenues to external customers 2,623 2,617 7,604 8,122  
Total revenues to external customers 34,598 31,965 106,312 95,883  
Operating income (loss) 6,114 6,976 22,222 22,688  
Total assets 130,077 108,993 130,077 108,993  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 32,402 28,718 99,423 88,353  
Service revenues to external customers 9,725 7,726 25,461 20,227  
Total revenues to external customers 42,127 36,444 124,884 108,580  
Operating income (loss) 6,149 6,087 21,322 18,228  
Total assets 189,191 178,685 189,191 178,685  
Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Product revenues to external customers [1] 0 0 0 0  
Service revenues to external customers [1] 0 0 0 0  
Total revenues to external customers [1] 0 0 0 0  
Operating income (loss) [1] (1,009) (903) (2,783) (2,420)  
Total assets [1] $ 112,973 $ 90,757 $ 112,973 $ 90,757  
[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.