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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2017
Feb. 28, 2017
Nov. 30, 2016
Aug. 31, 2016
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2017
May 31, 2016
May 31, 2015
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 $ 306,512 $ 273,570 $ 243,909
Service revenues to external customers                 55,082 47,705 39,165
Total revenues to external customers $ 98,847 $ 88,385 $ 90,717 $ 83,645 $ 90,080 $ 76,725 $ 79,610 $ 74,860 361,594 321,275 283,074
Operating income (loss)                 64,945 56,386 53,118
Depreciation and amortization                 14,691 12,181 10,649
Total Assets 528,409       449,940       528,409 449,940 392,181
Expenditures for long-lived assets                 14,578 14,222 9,619
Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 155,795 133,743 119,990
Service revenues to external customers                 15,530 12,678 11,489
Total revenues to external customers                 171,325 146,421 131,479
Operating income (loss)                 33,971 28,984 30,265
Depreciation and amortization                 7,088 5,609 4,620
Total Assets 190,895       143,303       190,895 143,303 110,655
Expenditures for long-lived assets                 10,332 9,192 4,216
Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 150,717 139,827 123,919
Service revenues to external customers                 39,552 35,027 27,676
Total revenues to external customers                 190,269 174,854 151,595
Operating income (loss)                 34,841 30,978 26,034
Depreciation and amortization                 7,603 6,572 6,029
Total Assets 210,927       215,374       210,927 215,374 179,082
Expenditures for long-lived assets                 4,246 5,030 5,403
Corporate and Eliminations                      
Segment Reporting Information [Line Items]                      
Operating income (loss) [1]                 (3,867) (3,576) (3,181)
Total Assets [1] $ 126,587       $ 91,263       $ 126,587 $ 91,263 $ 102,444
[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.