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v3.10.0.1

Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ 109,287 | $ 95,892 | $ 101,817 | $ 95,256 | $ 98,847 | $ 88,385 | $ 90,717 | $ 83,645 | $ 402,252 | $ 361,594 | $ 321,275
Operating income (loss) |  |  |  |  |  |  |  |  |  | 70,194 | 64,945 | 56,386
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 17,058 | 14,691 | 12,181
Total Assets |  | 618,009 |  |  |  | 528,409 |  |  |  | 618,009 | 528,409 | 449,940
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 20,946 | 14,578 | 14,222
Product Revenues |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 335,554 | 306,512 | 273,570
Service Revenues |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 66,698 | 55,082 | 47,705
Operating Segments | Food Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 196,047 | 171,325 | 146,421
Operating income (loss) |  |  |  |  |  |  |  |  |  | 34,561 | 33,971 | 28,984
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 9,083 | 7,088 | 5,609
Total Assets |  | 186,570 |  |  |  | 190,895 |  |  |  | 186,570 | 190,895 | 143,303
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 10,538 | 10,332 | 9,192
Operating Segments | Animal Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 206,205 | 190,269 | 174,854
Operating income (loss) |  |  |  |  |  |  |  |  |  | 39,529 | 34,841 | 30,978
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 7,975 | 7,603 | 6,572
Total Assets |  | 220,629 |  |  |  | 210,927 |  |  |  | 220,629 | 210,927 | 215,374
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 10,408 | 4,246 | 5,030
Operating Segments | Product Revenues | Food Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 176,123 | 155,795 | 133,743
Operating Segments | Product Revenues | Animal Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 159,431 | 150,717 | 139,827
Operating Segments | Service Revenues | Food Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 19,924 | 15,530 | 12,678
Operating Segments | Service Revenues | Animal Safety |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  |  |  |  |  |  |  |  |  | 46,774 | 39,552 | 35,027
Corporate and Eliminations |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) | [1] |  |  |  |  |  |  |  |  | (3,896) | (3,867) | (3,576)
Total Assets | [1] | $ 210,810 |  |  |  | $ 126,587 |  |  |  | $ 210,810 | $ 126,587 | $ 91,263
[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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