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v3.19.1

Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | [1] | Feb. 28, 2019 | Feb. 28, 2018 | May 31, 2018 | May 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ 97,700 |  | $ 94,903 |  | $ 304,424 |  | $ 289,811 | [2] |  |
Operating income (loss) |  | 14,639 |  | 15,913 |  | 49,364 |  | 50,335 | [2] | $ 70,194 | $ 64,945
Total assets |  | 672,585 |  | 595,601 |  | 672,585 |  | 595,601 | [1] | $ 618,009 |
Operating Segments | Food Safety |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 51,113 |  | 47,313 |  | 157,046 |  | 142,810 | [2] |  |
Operating income (loss) |  | 8,339 |  | 8,258 |  | 29,554 |  | 25,704 | [2] |  |
Total assets |  | 204,570 |  | 188,075 |  | 204,570 |  | 188,075 | [1] |  |
Operating Segments | Animal Safety |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 46,587 |  | 47,590 |  | 147,378 |  | 147,001 | [2] |  |
Operating income (loss) |  | 7,338 |  | 8,493 |  | 23,101 |  | 27,691 | [2] |  |
Total assets |  | 221,335 |  | 215,371 |  | 221,335 |  | 215,371 | [1] |  |
Product Revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 77,375 |  | 77,184 |  | 249,897 |  | 241,200 | [2] |  |
Product Revenues | Operating Segments | Food Safety |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 44,790 |  | 42,286 |  | 139,979 |  | 128,491 | [2] |  |
Product Revenues | Operating Segments | Animal Safety |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 32,585 |  | 34,898 |  | 109,918 |  | 112,709 | [2] |  |
Service Revenues |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 20,325 |  | 17,719 |  | 54,527 |  | 48,611 | [2] |  |
Service Revenues | Operating Segments | Food Safety |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 6,323 |  | 5,027 |  | 17,067 |  | 14,319 | [2] |  |
Service Revenues | Operating Segments | Animal Safety |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 14,002 |  | 12,692 |  | 37,460 |  | 34,292 | [2] |  |
Corporate and Eliminations | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 0 | [3] |  |  | 0 | [4] |  |  |  |
Operating income (loss) |  | (1,038) | [3] | (838) | [3] | (3,291) | [4] | (3,060) | [2],[4] |  |
Total assets | [3] | 246,680 |  | $ 192,155 |  | 246,680 |  | $ 192,155 | [1] |  |
Corporate and Eliminations | Product Revenues | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | 0 | [3] |  |  | 0 | [4] |  |  |  |
Corporate and Eliminations | Service Revenues | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ 0 | [3] |  |  | $ 0 | [4] |  |  |  |
[1] | Revenues for the three months ended February 28, 2018 have been revised as discussed in Note 1. For the three months ended February 28, 2018, product revenues were reduced by $332,000 in the Food Safety segment and $626,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and were reduced by $31,000 in the Animal Safety segment.
[2] | Revenues for the nine months ended February 28, 2018 have been revised as discussed in Note 1. For the nine months ended February 28, 2018, product revenues were reduced by $1,130,000 in the Food Safety segment and $1,968,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and reduced by $56,000 in the Animal Safety segment.
[3] | Includes corporate assets, consisting principally of 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.
[4] | Includes the elimination of intersegment transactions.

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