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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May 31, 2016
May 31, 2015
May 31, 2014
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 $ 273,570 $ 243,909 $ 216,148
Service revenues to external customers                 47,705 39,165 31,257
Total revenues to external customers $ 90,080 $ 76,725 $ 79,610 $ 74,860 $ 78,611 $ 68,409 $ 68,455 $ 67,599 321,275 283,074 247,405
Operating income (loss)                 56,386 53,118 43,391
Depreciation and amortization                 12,540 10,649 9,180
Total assets 451,715       392,181       451,715 392,181 345,301
Expenditures for long-lived assets                 14,222 9,619 11,543
Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 133,685 119,990 107,959
Service revenues to external customers                 12,156 11,489 8,331
Total revenues to external customers                 145,841 131,479 116,290
Operating income (loss)                 29,185 30,265 28,009
Depreciation and amortization                 5,745 4,620 4,181
Total assets 142,078       110,655       142,078 110,655 105,607
Expenditures for long-lived assets                 9,192 4,216 5,999
Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 139,885 123,919 108,189
Service revenues to external customers                 35,549 27,676 22,926
Total revenues to external customers                 175,434 151,595 131,115
Operating income (loss)                 30,777 26,034 18,571
Depreciation and amortization                 6,795 6,029 4,999
Total assets 216,599       179,082       216,599 179,082 173,643
Expenditures for long-lived assets                 5,030 5,403 5,544
Corporate and Eliminations                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers [1]                 0 0 0
Service revenues to external customers [1]                 0 0 0
Total revenues to external customers [1]                 0 0 0
Operating income (loss) [1]                 (3,576) (3,181) (3,189)
Depreciation and amortization [1]                 0 0 0
Total assets [1] $ 93,038       $ 102,444       93,038 102,444 66,051
Expenditures for long-lived assets [1]                 $ 0 $ 0 $ 0
[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 noncontrolling interests.