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v3.7.0.1

Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2017 | May 31, 2016 | May 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | $ 306,512 | $ 273,570 | $ 243,909
Service revenues to external customers |  |  |  |  |  |  |  |  |  | 55,082 | 47,705 | 39,165
Total revenues to external customers |  | $ 98,847 | $ 88,385 | $ 90,717 | $ 83,645 | $ 90,080 | $ 76,725 | $ 79,610 | $ 74,860 | 361,594 | 321,275 | 283,074
Operating income (loss) |  |  |  |  |  |  |  |  |  | 64,945 | 56,386 | 53,118
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 14,691 | 12,181 | 10,649
Total Assets |  | 528,409 |  |  |  | 449,940 |  |  |  | 528,409 | 449,940 | 392,181
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 14,578 | 14,222 | 9,619
Operating Segments | Food Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 155,795 | 133,743 | 119,990
Service revenues to external customers |  |  |  |  |  |  |  |  |  | 15,530 | 12,678 | 11,489
Total revenues to external customers |  |  |  |  |  |  |  |  |  | 171,325 | 146,421 | 131,479
Operating income (loss) |  |  |  |  |  |  |  |  |  | 33,971 | 28,984 | 30,265
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 7,088 | 5,609 | 4,620
Total Assets |  | 190,895 |  |  |  | 143,303 |  |  |  | 190,895 | 143,303 | 110,655
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 10,332 | 9,192 | 4,216
Operating Segments | Animal Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 150,717 | 139,827 | 123,919
Service revenues to external customers |  |  |  |  |  |  |  |  |  | 39,552 | 35,027 | 27,676
Total revenues to external customers |  |  |  |  |  |  |  |  |  | 190,269 | 174,854 | 151,595
Operating income (loss) |  |  |  |  |  |  |  |  |  | 34,841 | 30,978 | 26,034
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 7,603 | 6,572 | 6,029
Total Assets |  | 210,927 |  |  |  | 215,374 |  |  |  | 210,927 | 215,374 | 179,082
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 4,246 | 5,030 | 5,403
Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [1] |  |  |  |  |  |  |  |  | (3,867) | (3,576) | (3,181)
Total Assets | [1] | $ 126,587 |  |  |  | $ 91,263 |  |  |  | $ 126,587 | $ 91,263 | $ 102,444
[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 non-controlling interests.

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