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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
May 31, 2017
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 78,142 $ 73,964 $ 244,298 $ 223,170  
Service revenues to external customers 17,750 14,421 48,667 39,577  
Total revenues to external customers 95,892 88,385 292,965 262,747  
Operating income (loss) 15,913 14,351 50,335 45,945  
Total assets 595,601 507,298 595,601 507,298 $ 528,409
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 42,618 39,318 129,621 112,592  
Service revenues to external customers 5,027 3,631 14,319 10,475  
Total revenues to external customers 47,645 42,949 143,940 123,067  
Operating income (loss) 8,258 7,403 25,704 24,286  
Total assets 188,075 183,419 188,075 183,419  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 35,524 34,646 114,677 110,578  
Service revenues to external customers 12,723 10,790 34,348 29,102  
Total revenues to external customers 48,247 45,436 149,025 139,680  
Operating income (loss) 8,493 7,743 27,691 24,616  
Total assets 215,371 215,243 215,371 215,243  
Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Operating income (loss) [1] (838) (795) (3,060) (2,957)  
Total assets [1] $ 192,155 $ 108,636 $ 192,155 $ 108,636  
[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.