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Segment Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2014 | May 31, 2013 | May 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  |  | $ 219,734,000 |  | $ 184,134,000 |  | $ 164,910,000 |
Service revenues to external customers |  |  |  |  |  |  |  |  |  |  | 27,671,000 |  | 23,394,000 |  | 19,136,000 |
Total revenues to external customers | 67,262,000 |  | 61,996,000 | 59,599,000 | 58,548,000 | 56,007,000 |  | 51,055,000 | 50,737,000 | 49,729,000 | 247,405,000 |  | 207,528,000 |  | 184,046,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 43,391,000 |  | 40,706,000 |  | 33,739,000 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 9,180,000 |  | 7,411,000 |  | 6,173,000 |
Total assets | 345,301,000 |  |  |  |  | 290,558,000 |  |  |  |  | 345,301,000 |  | 290,558,000 |  | 251,600,000 |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 11,543,000 |  | 8,897,000 |  | 12,413,000 |
Operating Segments | Food Safety |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  |  | 111,545,000 |  | 102,971,000 |  | 90,460,000 |
Service revenues to external customers |  |  |  |  |  |  |  |  |  |  | 4,745,000 |  | 3,187,000 |  | 644,000 |
Total revenues to external customers |  |  |  |  |  |  |  |  |  |  | 116,290,000 |  | 106,158,000 |  | 91,104,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 28,009,000 |  | 27,366,000 |  | 23,932,000 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,181,000 |  | 3,874,000 |  | 3,500,000 |
Total assets | 105,607,000 |  |  |  |  | 93,079,000 |  |  |  |  | 105,607,000 |  | 93,079,000 |  | 62,227,000 |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 5,999,000 |  | 6,046,000 |  | 4,633,000 |
Operating Segments | Animal Safety |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  |  | 108,189,000 |  | 81,163,000 |  | 74,450,000 |
Service revenues to external customers |  |  |  |  |  |  |  |  |  |  | 22,926,000 |  | 20,207,000 |  | 18,492,000 |
Total revenues to external customers |  |  |  |  |  |  |  |  |  |  | 131,115,000 |  | 101,370,000 |  | 92,942,000 |
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | 18,571,000 |  | 15,858,000 |  | 12,039,000 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 4,999,000 |  | 3,537,000 |  | 2,673,000 |
Total assets | 173,643,000 |  |  |  |  | 121,908,000 |  |  |  |  | 173,643,000 |  | 121,908,000 |  | 106,987,000 |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | 5,544,000 |  | 2,851,000 |  | 7,780,000 |
Corporate Eliminations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Service revenues to external customers |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Total revenues to external customers |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Operating income (loss) |  |  |  |  |  |  |  |  |  |  | (3,189,000) | [1] | (2,518,000) | [1] | (2,232,000) | [1]
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Total assets | 66,051,000 | [1] |  |  |  | 75,571,000 | [1] |  |  |  | 66,051,000 | [1] | 75,571,000 | [1] | 82,386,000 | [1]
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  |  | $ 0 | [1] | $ 0 | [1] | $ 0 | [1]
[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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