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Segment Information (Tables) | 12 Months Ended
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May. 31, 2015
Segment Information | Segment information is as follows:
(in thousands) |  | Food Safety |  |  | Animal Safety |  |  | Corporate and Eliminations (1) |  |  | Total |
Fiscal 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 124,021 |  |  | $ | 123,919 |  |  | $ | 0 |  |  | $ | 247,940 |
Service revenues to external customers |  |  | 7,458 |  |  |  | 27,676 |  |  |  | 0 |  |  |  | 35,134 |
Total revenues to external customers |  |  | 131,479 |  |  |  | 151,595 |  |  |  | 0 |  |  |  | 283,074 |
Operating income (loss) |  |  | 30,265 |  |  |  | 26,034 |  |  |  | (3,181 | ) |  |  | 53,118 |
Depreciation and amortization |  |  | 4,620 |  |  |  | 6,029 |  |  |  | 0 |  |  |  | 10,649 |
Total assets |  |  | 145,576 |  |  |  | 144,161 |  |  |  | 102,444 |  |  |  | 392,181 |
Expenditures for long-lived assets |  |  | 4,216 |  |  |  | 5,403 |  |  |  | 0 |  |  |  | 9,619 |
Fiscal 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 111,545 |  |  | $ | 108,189 |  |  | $ | 0 |  |  | $ | 219,734 |
Service revenues to external customers |  |  | 4,745 |  |  |  | 22,926 |  |  |  | 0 |  |  |  | 27,671 |
Total revenues to external customers |  |  | 116,290 |  |  |  | 131,115 |  |  |  | 0 |  |  |  | 247,405 |
Operating income (loss) |  |  | 28,009 |  |  |  | 18,571 |  |  |  | (3,189 | ) |  |  | 43,391 |
Depreciation and amortization |  |  | 4,181 |  |  |  | 4,999 |  |  |  | 0 |  |  |  | 9,180 |
Total assets |  |  | 105,607 |  |  |  | 173,643 |  |  |  | 66,051 |  |  |  | 345,301 |
Expenditures for long-lived assets |  |  | 5,999 |  |  |  | 5,544 |  |  |  | 0 |  |  |  | 11,543 |
Fiscal 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 102,971 |  |  | $ | 81,163 |  |  | $ | 0 |  |  | $ | 184,134 |
Service revenues to external customers |  |  | 3,187 |  |  |  | 20,207 |  |  |  | 0 |  |  |  | 23,394 |
Total revenues to external customers |  |  | 106,158 |  |  |  | 101,370 |  |  |  | 0 |  |  |  | 207,528 |
Operating income (loss) |  |  | 27,366 |  |  |  | 15,858 |  |  |  | (2,518 | ) |  |  | 40,706 |
Depreciation and amortization |  |  | 3,874 |  |  |  | 3,537 |  |  |  | 0 |  |  |  | 7,411 |
Total assets |  |  | 93,079 |  |  |  | 121,908 |  |  |  | 75,571 |  |  |  | 290,558 |
Expenditures for long-lived assets |  |  | 6,046 |  |  |  | 2,851 |  |  |  | 0 |  |  |  | 8,897 |
(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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8736-108599 + Details
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