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Segment Information and Geographic Data - Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2022
Aug. 31, 2021
May 31, 2022
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 132,349 $ 128,305  
Operating income (loss) 6,062 21,745  
Total Assets 977,405 932,106 $ 992,929
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 64,643 62,722  
Operating income (loss) 8,597 10,131  
Total Assets 318,463 291,018  
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 67,706 65,583  
Operating income (loss) 11,881 12,762  
Total Assets 311,231 240,208  
Product Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 106,792 104,013  
Product Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 57,790 55,945  
Product Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 49,002 48,068  
Service Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 25,557 24,292  
Service Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 6,853 6,777  
Service Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 18,704 17,515  
Corporate and Eliminations | Operating Segments      
Segment Reporting Information [Line Items]      
Product revenues to external customers [1] 0    
Operating income (loss) [1] (14,416) (1,148)  
Total Assets [1] 347,711 $ 400,880  
Corporate and Eliminations | Product Revenues | Operating Segments      
Segment Reporting Information [Line Items]      
Product revenues to external customers [1] 0    
Corporate and Eliminations | Service Revenues | Operating Segments      
Segment Reporting Information [Line Items]      
Product revenues to external customers [1] $ 0    
[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.