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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.

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