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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Nov. 30, 2017
Nov. 30, 2016
May 31, 2017
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 85,590 $ 76,961 $ 166,157 $ 149,206  
Service revenues to external customers 16,227 13,756 30,916 25,156  
Total revenues to external customers 101,817 90,717 197,073 174,362  
Operating income (loss) 17,998 16,852 34,422 31,594  
Total assets 581,028 487,311 581,028 487,311 $ 528,409
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 44,721 37,366 87,004 73,059  
Service revenues to external customers 4,839 3,595 9,291 7,059  
Total revenues to external customers 49,560 40,961 96,295 80,118  
Operating income (loss) 8,668 8,883 17,446 16,882  
Total assets 175,836 143,901 175,836 143,901  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 40,869 39,595 79,153 76,147  
Service revenues to external customers 11,388 10,161 21,625 18,097  
Total revenues to external customers 52,257 49,756 100,778 94,244  
Operating income (loss) 10,529 9,094 19,198 16,874  
Total assets 215,099 215,974 215,099 215,974  
Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Operating income (loss) [1] (1,199) (1,125) (2,222) (2,162)  
Total assets [1] $ 190,093 $ 127,436 $ 190,093 $ 127,436  
[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.