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Segment Information and Geographical Data (Tables) | 6 Months Ended
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Nov. 30, 2018
Segment Information | Segment information follows:
|  | Food Safety |  |  | Animal Safety |  |  | Corporate and Eliminations (1) |  |  | Total |
|  | (in thousands) |
As of and for the three months ended November 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 48,256 |  |  | $ | 41,306 |  |  | $ | — |  |  | $ | 89,562 |
Service revenues to external customers |  |  | 5,494 |  |  |  | 12,042 |  |  |  | — |  |  |  | 17,536 |
Total revenues to external customers |  |  | 53,750 |  |  |  | 53,348 |  |  |  | — |  |  |  | 107,098 |
Operating income (loss) |  |  | 10,342 |  |  |  | 9,057 |  |  |  | (1,153 | ) |  |  | 18,246 |
Total assets |  |  | 201,291 |  |  |  | 218,231 |  |  |  | 240,970 |  |  |  | 660,492 |
As of and for the three months ended November 30, 2017—Revised (2) |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 44,367 |  |  | $ | 40,104 |  |  | $ | — |  |  | $ | 84,471 |
Service revenues to external customers |  |  | 4,839 |  |  |  | 11,388 |  |  |  | — |  |  |  | 16,227 |
Total revenues to external customers |  |  | 49,206 |  |  |  | 51,492 |  |  |  | — |  |  |  | 100,698 |
Operating income (loss) |  |  | 8,668 |  |  |  | 10,529 |  |  |  | (1,199 | ) |  |  | 17,998 |
Total assets |  |  | 175,836 |  |  |  | 215,099 |  |  |  | 190,093 |  |  |  | 581,028 |
(1) | 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.
(2) | Segment revenues for the three months ended November 30, 2017 have been revised as discussed in Note 1. For the three months ended November 30, 2017, product revenues were reduced by $354,000 in the Food Safety segment and $765,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and in the Animal Safety segment.
|  | Food Safety |  |  | Animal Safety |  |  | Corporate and Eliminations (1) |  |  | Total |
|  | (in thousands) |
For the six months ended November 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 95,189 |  |  | $ | 77,333 |  |  | $ | — |  |  | $ | 172,522 |
Service revenues to external customers |  |  | 10,744 |  |  |  | 23,458 |  |  |  | — |  |  |  | 34,202 |
Total revenues to external customers |  |  | 105,933 |  |  |  | 100,791 |  |  |  | — |  |  |  | 206,724 |
Operating income (loss) |  |  | 21,215 |  |  |  | 15,763 |  |  |  | (2,253 | ) |  |  | 34,725 |
For the six months ended November 30, 2017—Revised (2) |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 86,206 |  |  | $ | 77,810 |  |  | $ | — |  |  | $ | 164,016 |
Service revenues to external customers |  |  | 9,291 |  |  |  | 21,600 |  |  |  | — |  |  |  | 30,891 |
Total revenues to external customers |  |  | 95,497 |  |  |  | 99,410 |  |  |  | — |  |  |  | 194,907 |
Operating income (loss) |  |  | 17,446 |  |  |  | 19,198 |  |  |  | (2,222 | ) |  |  | 34,422 |
(1) | Includes the elimination of intersegment transactions.
(2) | Segment revenues for the six months ended November 30, 2017 have been revised as discussed in Note 1. For the six months ended November 30, 2017, product revenues were reduced by $798,000 in the Food Safety segment and $1,343,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and reduced by $25,000 in the Animal Safety segment.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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