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Segment Information and Geographic Data (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 29, 2020
Feb. 28, 2019
May 31, 2019
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 99,869 $ 97,700 $ 309,096 $ 304,424  
Operating income (loss) 13,043 14,639 47,579 49,364  
Total assets 773,501 672,585 773,501 672,585 $ 695,740
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 50,498 51,113 158,374 157,046  
Operating income (loss) 5,881 8,339 24,571 29,554  
Total assets 226,077 204,570 226,077 204,570  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 49,371 46,587 150,722 147,378  
Operating income (loss) 8,492 7,338 26,521 23,101  
Total assets 219,501 221,335 219,501 221,335  
Product Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 77,736 77,375 247,071 249,897  
Product Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 44,450 44,790 141,516 139,979  
Product Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 33,286 32,585 105,555 109,918  
Service Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 22,133 20,325 62,025 54,527  
Service Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 6,048 6,323 16,858 17,067  
Service Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 16,085 14,002 45,167 37,460  
Corporate and Eliminations | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income (loss) (1,330) [1] (1,038) [1] (3,513) [2] (3,291) [2]  
Total assets [1] $ 327,923 $ 246,680 $ 327,923 $ 246,680  
[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.