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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2017 | May 31, 2016
Goodwill [Line Items] |  |  |
Beginning Balance | $ 88,506 |  | $ 70,119
Goodwill acquired and/or adjusted | 16,253 | [1] | 18,387
Ending Balance | 104,759 |  | 88,506
Food Safety |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 26,889 |  | 18,806
Goodwill acquired and/or adjusted | 19,031 | [1] | 8,083
Ending Balance | 45,920 |  | 26,889
Animal Safety |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 61,617 |  | 51,313
Goodwill acquired and/or adjusted | (2,778) | [1] | 10,304
Ending Balance | $ 58,839 |  | $ 61,617
[1] | Represents final purchase price allocation adjustment

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- Definition Amount after accumulated impairment loss 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase (decrease) 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://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 + Details
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