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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May. 31, 2015
May. 31, 2014
May. 31, 2013
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 $ 247,940 $ 219,734 $ 184,134
Service revenues to external customers                 35,134 27,671 23,394
Total revenues to external customers $ 78,611 $ 68,409 $ 68,455 $ 67,599 $ 67,262 $ 61,996 $ 59,599 $ 58,548 283,074 247,405 207,528
Operating income (loss)                 53,118 43,391 40,706
Depreciation and amortization                 10,649 9,180 7,411
Total assets 392,181       345,301       392,181 345,301 290,558
Expenditures for long-lived assets                 9,619 11,543 8,897
Operating Segments | Food Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 124,021 111,545 102,971
Service revenues to external customers                 7,458 4,745 3,187
Total revenues to external customers                 131,479 116,290 106,158
Operating income (loss)                 30,265 28,009 27,366
Depreciation and amortization                 4,620 4,181 3,874
Total assets 145,576       105,607       145,576 105,607 93,079
Expenditures for long-lived assets                 4,216 5,999 6,046
Operating Segments | Animal Safety                      
Segment Reporting Information [Line Items]                      
Product revenues to external customers                 123,919 108,189 81,163
Service revenues to external customers                 27,676 22,926 20,207
Total revenues to external customers                 151,595 131,115 101,370
Operating income (loss)                 26,034 18,571 15,858
Depreciation and amortization                 6,029 4,999 3,537
Total assets 144,161       173,643       144,161 173,643 121,908
Expenditures for long-lived assets                 5,403 5,544 2,851
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]                 (3,181) (3,189) (2,518)
Depreciation and amortization [1]                 0 0 0
Total assets [1] $ 102,444       $ 66,051       102,444 66,051 75,571
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.