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Segment Information and Geographic Data - Schedule of Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
May 31, 2021
Segment Reporting Information [Line Items]          
Product revenues to external customers $ 128,244 $ 116,709 $ 387,066 $ 341,034  
Operating income (loss) 6,377 15,774 40,591 53,914  
Total Assets 981,205 880,216 981,205 880,216 $ 920,192
Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 62,756 58,424 192,610 170,143  
Operating income (loss) 8,191 7,911 29,216 24,834  
Total Assets 302,605 287,690 302,605 287,690  
Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 65,488 58,285 194,456 170,891  
Operating income (loss) 10,783 11,657 36,246 36,068  
Total Assets 298,854 239,179 298,854 239,179  
Product Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 101,566 92,816 311,700 273,288  
Product Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 55,372 51,965 171,439 151,951  
Product Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 46,194 40,851 140,261 121,337  
Service Revenues          
Segment Reporting Information [Line Items]          
Product revenues to external customers 26,678 23,893 75,366 67,746  
Service Revenues | Operating Segments | Food Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 7,384 6,459 21,171 18,192  
Service Revenues | Operating Segments | Animal Safety          
Segment Reporting Information [Line Items]          
Product revenues to external customers 19,294 17,434 54,195 49,554  
Corporate and Eliminations | Operating Segments          
Segment Reporting Information [Line Items]          
Operating income (loss) (12,597) [1] (3,794) [1] [2] (6,988) [2]  
Total Assets [1] $ 379,746 $ 353,347 $ 379,746 $ 353,347  
[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.