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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
May 31, 2019
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 107,803 $ 107,098 $ 209,227 $ 206,724  
Operating income (loss) 18,272 18,246 34,536 34,725  
Total assets 750,591 660,492 750,591 660,492 $ 695,740
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 56,854 53,750 107,875 105,933  
Operating income (loss) 9,556 10,342 18,690 21,215  
Total assets 212,928 201,291 212,928 201,291  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 50,949 53,348 101,352 100,791  
Operating income (loss) 9,729 9,057 18,029 15,763  
Total assets 224,058 218,231 224,058 218,231  
Product Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 87,387 89,562 169,335 172,522  
Product Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 51,188 48,256 97,065 95,189  
Product Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 36,199 41,306 72,270 77,333  
Service Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 20,416 17,536 39,892 34,202  
Service Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 5,666 5,494 10,810 10,744  
Service Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 14,750 12,042 29,082 23,458  
Corporate and Eliminations | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income (loss) (1,013) [1] (1,153) [1] (2,183) [2] (2,253) [2]  
Total assets [1] $ 313,605 $ 240,970 $ 313,605 $ 240,970  
[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.