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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2019 | May 31, 2018
Goodwill [Line Items] |  |  |
Beginning Balance |  | $ 99,558 | $ 104,759
Goodwill acquired |  | 4,992 | 757
Goodwill adjustments and/or currency | [1] | (931) | (5,958)
Ending Balance |  | 103,619 | 99,558
Food Safety |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance |  | 40,001 | 45,920
Goodwill acquired |  | 3,796 |
Goodwill adjustments and/or currency | [1] | (1,244) | (5,919)
Ending Balance |  | 42,553 | 40,001
Animal Safety |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance |  | 59,557 | 58,839
Goodwill acquired |  | 1,196 | 757
Goodwill adjustments and/or currency | [1] | 313 | (39)
Ending Balance |  | $ 61,066 | $ 59,557
[1] | Includes final purchase price allocation adjustment.

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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