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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Aug. 31, 2020
 [1]
Nov. 30, 2021
Nov. 30, 2020
May 31, 2021
Segment Reporting Information [Line Items]            
Product revenues to external customers $ 130,517 $ 115,000   $ 258,822 $ 224,325  
Operating income (loss) 12,469 19,245   34,214 38,140  
Total Assets 967,934 845,626   967,934 845,626 $ 920,192
Operating Segments | Food Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 67,132 57,534   129,854 111,719  
Operating income (loss) 10,894 8,960   21,026 16,923  
Total Assets 298,437 226,735   298,437 226,735  
Operating Segments | Animal Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 63,385 57,466   128,968 112,606  
Operating income (loss) 12,701 12,246   25,463 24,411  
Total Assets 278,994 228,126   278,994 228,126  
Product Revenues            
Segment Reporting Information [Line Items]            
Product revenues to external customers 106,111 92,537   210,124 180,472  
Product Revenues | Operating Segments | Food Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 60,112 51,323   116,057 99,986  
Product Revenues | Operating Segments | Animal Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 45,999 41,214   94,067 80,486  
Service Revenues            
Segment Reporting Information [Line Items]            
Product revenues to external customers 24,406 22,463   48,698 43,853  
Service Revenues | Operating Segments | Food Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 7,020 6,211   13,797 11,733  
Service Revenues | Operating Segments | Animal Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 17,386 16,252   34,901 32,120  
Corporate and Eliminations | Operating Segments            
Segment Reporting Information [Line Items]            
Operating income (loss) (11,126) [1]   $ (1,961) (12,275) [2] (3,194) [2]  
Total Assets [1] $ 390,503 $ 390,765   $ 390,503 $ 390,765  
[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.
[2] Includes elimination of intersegment transactions.