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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2020
Aug. 31, 2019
May 31, 2020
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 109,325 $ 101,424  
Operating income (loss) 18,895 16,264  
Total Assets 821,592 721,144 $ 797,182
Operating Segments | Corporate and Eliminations      
Segment Reporting Information [Line Items]      
Operating income (loss) [1] (1,233) (1,170)  
Total Assets [1] 367,486 291,016  
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 54,185 51,021  
Operating income (loss) 7,963 9,134  
Total Assets 225,716 207,725  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 55,140 50,403  
Operating income (loss) 12,165 8,300  
Total Assets 228,390 222,403  
Product Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 87,935 81,948  
Product Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 48,663 45,877  
Product Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 39,272 36,071  
Service Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 21,390 19,476  
Service Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 5,522 5,144  
Service Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 15,868 $ 14,332  
[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.