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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.

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