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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2019
Feb. 28, 2019
Nov. 30, 2018
Aug. 31, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2019
May 31, 2018
May 31, 2017
Segment Reporting Information [Line Items]                      
Product revenues to external customers $ 109,762 $ 97,700 $ 107,098 $ 99,626 $ 108,120 $ 94,903 $ 100,698 $ 94,209 $ 414,186 $ 397,930 $ 358,277
Operating income (loss)                 68,094 70,194 64,945
Depreciation and amortization                 17,624 17,058 14,691
Total assets 695,740       618,009       695,740 618,009 528,409
Expenditures for long-lived assets                 14,661 20,946 14,578
Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 213,474 194,477 170,034
Operating income (loss)                 39,020 34,561 33,971
Depreciation and amortization                 9,525 9,083 7,088
Total assets 206,267       186,570       206,267 186,570 190,895
Expenditures for long-lived assets                 8,916 10,538 10,332
Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 200,712 203,453 188,243
Operating income (loss)                 33,875 39,529 34,841
Depreciation and amortization                 8,099 7,975 7,603
Total assets 221,950       220,629       221,950 220,629 210,927
Expenditures for long-lived assets                 5,745 10,408 4,246
Product Revenues                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 339,439 331,288 303,148
Product Revenues | Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 190,675 174,553 154,431
Product Revenues | Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 148,764 156,735 148,717
Service Revenues                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 74,747 66,642 55,129
Service Revenues | Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 22,799 19,924 15,603
Service Revenues | Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 51,948 46,718 39,526
Corporate and Eliminations | Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income (loss) [1]                 (4,801) (3,896) (3,867)
Total assets [1] $ 267,523       $ 210,810       $ 267,523 $ 210,810 $ 126,587
[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.