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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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May 31, 2018
Goodwill by Business Segment | The following table summarizes goodwill by reportable segment:
(in thousands) |  | Food Safety |  |  | Animal Safety |  |  | Total |
Balance, May 31, 2016 |  | $ | 26,889 |  |  | $ | 61,617 |  |  | $ | 88,506 |
Goodwill acquired |  |  | 19,051 |  |  |  | — |  |  |  | 19,051 |
Goodwill adjustments and/or currency (1) |  |  | (20 | ) |  |  | (2,778 | ) |  |  | (2,798 | )
Balance, May 31, 2017 |  | $ | 45,920 |  |  | $ | 58,839 |  |  | $ | 104,759 |
Goodwill acquired |  |  | — |  |  |  | 757 |  |  |  | 757 |
Goodwill adjustments and/or currency (1) |  |  | (5,919 | ) |  |  | (39 | ) |  |  | (5,958 | )
Balance, May 31, 2018 |  | $ | 40,001 |  |  | $ | 59,557 |  |  | $ | 99,558 |
(1) | Includes final purchase price allocation adjustment.
Amortizable of Intangible Assets | Amortizable intangible assets consisted of the following and are included in customer-based intangible and other non-current assets within the consolidated balance sheets:
(in thousands) |  | Gross Carrying Amount |  |  | Less Accumulated Amortization |  |  | Net Carrying Amount |
Licenses |  | $ | 9,491 |  |  | $ | 2,523 |  |  | $ | 6,968 |
Covenants not to compete |  |  | 801 |  |  |  | 483 |  |  |  | 318 |
Patents |  |  | 9,693 |  |  |  | 5,013 |  |  |  | 4,680 |
Customer-based intangibles |  |  | 56,420 |  |  |  | 24,579 |  |  |  | 31,841 |
Other products and service-related intangibles |  |  | 15,299 |  |  |  | 4,451 |  |  |  | 10,848 |
Balance, May 31, 2018 |  | $ | 91,704 |  |  | $ | 37,049 |  |  | $ | 54,655 |
Licenses |  | $ | 5,989 |  |  | $ | 2,011 |  |  | $ | 3,978 |
Covenants not to compete |  |  | 1,208 |  |  |  | 309 |  |  |  | 899 |
Patents |  |  | 9,304 |  |  |  | 4,601 |  |  |  | 4,703 |
Customer-based intangibles |  |  | 56,829 |  |  |  | 20,846 |  |  |  | 35,983 |
Other products and service-related intangibles |  |  | 12,065 |  |  |  | 3,010 |  |  |  | 9,055 |
Balance, May 31, 2017 |  | $ | 85,395 |  |  | $ | 30,777 |  |  | $ | 54,618 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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