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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
May 31, 2020
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 115,000 $ 107,803 $ 224,325 $ 209,227  
Operating income (loss) 19,245 18,272 38,140 34,536  
Total Assets 845,626 750,591 845,626 750,591 $ 797,182
Operating Segments | Corporate and Eliminations          
Segment Reporting Information [Line Items]          
Operating income (loss) (1,961) [1] (1,013) [1] (3,194) [2] (2,183) [2]  
Total Assets [1] 390,765 313,605 390,765 313,605  
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 57,534 56,854 111,719 107,876  
Operating income (loss) 8,960 9,556 16,923 18,690  
Total Assets 226,735 212,928 226,735 212,928  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 57,466 50,949 112,606 101,351  
Operating income (loss) 12,246 9,729 24,411 18,029  
Total Assets 228,126 224,058 228,126 224,058  
Product Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 92,537 87,387 180,472 169,335  
Product Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 51,323 51,188 99,986 97,065  
Product Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 41,214 36,199 80,486 72,270  
Service Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 22,463 20,416 43,853 39,892  
Service Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 6,211 5,666 11,733 10,811  
Service Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 16,252 $ 14,750 $ 32,120 $ 29,081  
[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.