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Segment Information (Tables) | 12 Months Ended
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May 31, 2020
Segment Information | Segment information is as follows:
(in thousands) |  | Food Safety |  |  | Animal Safety |  |  | Corporate and Eliminations (1) |  |  | Total |
Fiscal 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 189,893 |  |  | $ | 145,646 |  |  | $ | — |  |  | $ | 335,539 |
Service revenues to external customers |  |  | 22,798 |  |  |  | 59,833 |  |  |  | — |  |  |  | 82,631 |
Total revenues to external customers |  |  | 212,691 |  |  |  | 205,479 |  |  |  | — |  |  |  | 418,170 |
Operating income (loss) |  |  | 33,526 |  |  |  | 39,051 |  |  |  | (5,054 | ) |  |  | 67,523 |
Depreciation and amortization |  |  | 10,173 |  |  |  | 8,223 |  |  |  | — |  |  |  | 18,396 |
Total Assets |  |  | 222,331 |  |  |  | 231,178 |  |  |  | 343,673 |  |  |  | 797,182 |
Expenditures for long-lived assets |  |  | 15,867 |  |  |  | 8,185 |  |  |  | — |  |  |  | 24,052 |
Fiscal 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 190,675 |  |  | $ | 148,764 |  |  | $ | — |  |  | $ | 339,439 |
Service revenues to external customers |  |  | 22,799 |  |  |  | 51,948 |  |  |  | — |  |  |  | 74,747 |
Total revenues to external customers |  |  | 213,474 |  |  |  | 200,712 |  |  |  | — |  |  |  | 414,186 |
Operating income (loss) |  |  | 39,020 |  |  |  | 33,875 |  |  |  | (4,801 | ) |  |  | 68,094 |
Depreciation and amortization |  |  | 9,525 |  |  |  | 8,099 |  |  |  | — |  |  |  | 17,624 |
Total Assets |  |  | 206,267 |  |  |  | 221,950 |  |  |  | 267,523 |  |  |  | 695,740 |
Expenditures for long-lived assets |  |  | 8,916 |  |  |  | 5,745 |  |  |  | — |  |  |  | 14,661 |
Fiscal 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product revenues to external customers |  | $ | 174,553 |  |  | $ | 156,735 |  |  | $ | — |  |  | $ | 331,288 |
Service revenues to external customers |  |  | 19,924 |  |  |  | 46,718 |  |  |  | — |  |  |  | 66,642 |
Total revenues to external customers |  |  | 194,477 |  |  |  | 203,453 |  |  |  | — |  |  |  | 397,930 |
Operating income (loss) |  |  | 34,561 |  |  |  | 39,529 |  |  |  | (3,896 | ) |  |  | 70,194 |
Depreciation and amortization |  |  | 9,083 |  |  |  | 7,975 |  |  |  | — |  |  |  | 17,058 |
Total Assets |  |  | 186,570 |  |  |  | 220,629 |  |  |  | 210,810 |  |  |  | 618,009 |
Expenditures for long-lived assets |  |  | 10,538 |  |  |  | 10,408 |  |  |  | — |  |  |  | 20,946 |
(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.
Disaggregated Revenue | The following table presents the Company’s revenue disaggregated by geographical location:
|  | Year ended May 31 |
(in thousands) |  | 2020 |  |  | 2019 |
Domestic |  | $ | 253,458 |  |  | $ | 248,304 |
International |  |  | 164,712 |  |  |  | 165,882 |
Total revenue |  |  | 418,170 |  |  |  | 414,186 |

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