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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2018
May 31, 2017
May 31, 2016
Segment Reporting Information [Line Items]                      
Product revenues to external customers $ 109,287 $ 95,892 $ 101,817 $ 95,256 $ 98,847 $ 88,385 $ 90,717 $ 83,645 $ 402,252 $ 361,594 $ 321,275
Operating income (loss)                 70,194 64,945 56,386
Depreciation and amortization                 17,058 14,691 12,181
Total Assets 618,009       528,409       618,009 528,409 449,940
Expenditures for long-lived assets                 20,946 14,578 14,222
Product Revenues                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 335,554 306,512 273,570
Service Revenues                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 66,698 55,082 47,705
Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 196,047 171,325 146,421
Operating income (loss)                 34,561 33,971 28,984
Depreciation and amortization                 9,083 7,088 5,609
Total Assets 186,570       190,895       186,570 190,895 143,303
Expenditures for long-lived assets                 10,538 10,332 9,192
Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 206,205 190,269 174,854
Operating income (loss)                 39,529 34,841 30,978
Depreciation and amortization                 7,975 7,603 6,572
Total Assets 220,629       210,927       220,629 210,927 215,374
Expenditures for long-lived assets                 10,408 4,246 5,030
Operating Segments | Product Revenues | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 176,123 155,795 133,743
Operating Segments | Product Revenues | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 159,431 150,717 139,827
Operating Segments | Service Revenues | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 19,924 15,530 12,678
Operating Segments | Service Revenues | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 46,774 39,552 35,027
Corporate and Eliminations                      
Segment Reporting Information [Line Items]                      
Operating income (loss) [1]                 (3,896) (3,867) (3,576)
Total Assets [1] $ 210,810       $ 126,587       $ 210,810 $ 126,587 $ 91,263
[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.