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Segment Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2022
May 31, 2021
May 31, 2020
Segment Reporting Information [Line Items]      
Product revenues to external customers $ 527,159 $ 468,459 $ 418,170
Operating income (loss) 58,618 74,169 67,523
Depreciation and amortization 23,694 21,041 18,396
Total Assets 992,929 920,192 797,182
Expenditures for long-lived assets 24,781 26,712 24,052
Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 259,979 234,244 212,691
Operating income (loss) 38,581 33,725 33,526
Depreciation and amortization 13,386 11,575 10,173
Total Assets 304,461 295,065 222,331
Expenditures for long-lived assets 7,842 13,730 15,867
Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 267,180 234,215 205,479
Operating income (loss) 52,546 48,685 39,051
Depreciation and amortization 10,308 9,466 8,223
Total Assets 307,417 244,039 231,178
Expenditures for long-lived assets 16,939 12,982 8,185
Product Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 424,664 376,302 335,539
Product Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 231,626 209,104 189,893
Product Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 193,038 167,198 145,646
Service Revenues      
Segment Reporting Information [Line Items]      
Product revenues to external customers 102,495 92,157 82,631
Service Revenues | Operating Segments | Food Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 28,353 25,140 22,798
Service Revenues | Operating Segments | Animal Safety      
Segment Reporting Information [Line Items]      
Product revenues to external customers 74,142 67,017 59,833
Corporate and Eliminations | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income (loss) [1] (32,509) (8,241) (5,054)
Total Assets [1] $ 381,051 $ 381,088 $ 343,673
[1] Includes corporate assets, including 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 and non-controlling interests.