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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2021
Aug. 31, 2020
May 31, 2021
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 128,305 $ 109,325  
Operating income (loss) 21,745 18,895  
Total Assets 932,106 821,592 $ 920,192
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 62,722 54,185  
Operating income (loss) 10,131 7,963  
Total Assets 291,018 225,716  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 65,583 55,140  
Operating income (loss) 12,762 12,165  
Total Assets 240,208 228,390  
Product Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 104,013 87,935  
Product Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 55,945 48,663  
Product Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 48,068 39,272  
Service Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 24,292 21,390  
Service Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 6,777 5,522  
Service Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 17,515 15,868  
Corporate and Eliminations | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income (loss) [1] (1,148) (1,233)  
Total Assets [1] $ 400,880 $ 367,486  
[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.