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Segment Information and Geographic Data - Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
May 31, 2023
Feb. 28, 2023
Segment Reporting Information [Line Items]        
Product revenues to external customers $ 228,987 $ 132,349    
Operating income (loss) 19,135 6,062    
Total Assets 4,561,105 977,405 $ 4,554,432 $ 4,561,105
Operating Segments | Food Safety        
Segment Reporting Information [Line Items]        
Product revenues to external customers 166,278 64,643    
Operating income (loss) 22,241 8,597    
Total Assets 3,983,553 318,463    
Operating Segments | Animal Safety        
Segment Reporting Information [Line Items]        
Product revenues to external customers 62,709 67,706    
Operating income (loss) 8,356 11,881    
Total Assets 338,297 311,231    
Product Revenues        
Segment Reporting Information [Line Items]        
Product revenues to external customers 204,401 106,792    
Product Revenues | Operating Segments | Food Safety        
Segment Reporting Information [Line Items]        
Product revenues to external customers 158,947 57,790    
Product Revenues | Operating Segments | Animal Safety        
Segment Reporting Information [Line Items]        
Product revenues to external customers 45,454 49,002    
Service Revenues        
Segment Reporting Information [Line Items]        
Product revenues to external customers 24,586 25,557    
Service Revenues | Operating Segments | Food Safety        
Segment Reporting Information [Line Items]        
Product revenues to external customers 7,331 6,853    
Service Revenues | Operating Segments | Animal Safety        
Segment Reporting Information [Line Items]        
Product revenues to external customers 17,255 18,704    
Corporate and Eliminations | Operating Segments        
Segment Reporting Information [Line Items]        
Product revenues to external customers [1] 0 0    
Operating income (loss) [1] (11,462) (14,416)    
Total Assets [1] 239,255 347,711    
Corporate and Eliminations | Product Revenues | Operating Segments        
Segment Reporting Information [Line Items]        
Product revenues to external customers [1] 0 0    
Corporate and Eliminations | Service Revenues | Operating Segments        
Segment Reporting Information [Line Items]        
Product revenues to external customers [1] $ 0 $ 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.