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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
May 31, 2016
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 73,964 $ 64,377 $ 223,170 $ 198,131  
Service revenues to external customers 14,421 12,348 39,577 33,065  
Total revenues to external customers 88,385 76,725 262,747 231,196  
Operating income (loss) 14,351 11,254 45,945 40,761  
Total assets 507,298 432,241 507,298 432,241 $ 451,715
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 39,318 31,975 112,592 98,708  
Service revenues to external customers 3,631 2,735 10,475 7,998  
Total revenues to external customers 42,949 34,710 123,067 106,706  
Operating income (loss) 7,403 6,091 24,286 22,216  
Total assets 183,419 130,077 183,419 130,077  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 34,646 32,402 110,578 99,423  
Service revenues to external customers 10,790 9,613 29,102 25,067  
Total revenues to external customers 45,436 42,015 139,680 124,490  
Operating income (loss) 7,743 6,172 24,616 21,328  
Total assets 215,243 189,191 215,243 189,191  
Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Operating income (loss) [1] (795) (1,009) (2,957) (2,783)  
Total assets [1] $ 108,636 $ 112,973 $ 108,636 $ 112,973  
[1] Includes corporate assets, consisting principally of cash and cash equivalents, marketable securities, current and deferred tax accounts and overhead expenses not allocated to specific business segments. Also includes the elimination of intersegment transactions.