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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
May 31, 2020
Segment Reporting Information [Line Items]          
Product revenues to external customers     $ 341,034 $ 309,096  
Operating income (loss) $ 15,774 $ 13,043 53,914 47,579  
Total Assets 880,216   880,216   $ 797,182
Operating Segments          
Segment Reporting Information [Line Items]          
Product revenues to external customers 116,709 99,869      
Operating income (loss) 15,774 13,043      
Total Assets 880,216 773,501 880,216 773,501  
Operating Segments | Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Product revenues to external customers 0   0    
Operating income (loss) (3,794) (1,330) (6,988) (3,513)  
Total Assets 353,347 327,923 353,347 327,923  
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 58,424 50,498 170,143 158,374  
Operating income (loss) 7,911 5,881 24,834 24,571  
Total Assets 287,690 226,077 287,690 226,077  
Operating Segments | Food Safety | Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Product revenues to external customers     0    
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 58,285 49,371 170,891 150,722  
Operating income (loss) 11,657 8,492 36,068 26,521  
Total Assets 239,179 219,501 239,179 219,501  
Operating Segments | Animal Safety | Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Product revenues to external customers     0    
Product Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers     273,288 247,071  
Product Revenues | Operating Segments          
Segment Reporting Information [Line Items]          
Product revenues to external customers 92,816 77,736      
Product Revenues | Operating Segments | Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Product revenues to external customers 0        
Product Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 51,965 44,450 151,951 141,516  
Product Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 40,851 33,286 121,337 105,555  
Service Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers     67,746 62,025  
Service Revenues | Operating Segments          
Segment Reporting Information [Line Items]          
Product revenues to external customers 23,893 22,133      
Service Revenues | Operating Segments | Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Product revenues to external customers 0        
Service Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 6,459 6,048 18,192 16,858  
Service Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 17,434 $ 16,085 $ 49,554 $ 45,167