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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2017
Aug. 31, 2016
May 31, 2017
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 80,567 $ 72,245  
Service revenues to external customers 14,689 11,400  
Total revenues to external customers 95,256 83,645  
Operating income (loss) 16,424 14,742  
Total assets 547,334 468,615 $ 528,409
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 42,282 35,693  
Service revenues to external customers 4,452 3,464  
Total revenues to external customers 46,734 39,157  
Operating income (loss) 8,777 7,999  
Total assets 194,857 143,990  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 38,285 36,552  
Service revenues to external customers 10,237 7,936  
Total revenues to external customers 48,522 44,488  
Operating income (loss) 8,669 7,780  
Total assets 209,404 210,176  
Corporate and Eliminations      
Segment Reporting Information [Line Items]      
Operating income (loss) [1] (1,022) (1,037)  
Total assets [1] $ 143,073 $ 114,449  
[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.