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Goodwill By Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2016 | May 31, 2015
Goodwill [Line Items] |  |
Beginning Balance | $ 70,119 | $ 68,190
Goodwill acquired and/or adjusted | 18,387 | 1,929
Ending Balance | 88,506 | 70,119
Food Safety |  |
Goodwill [Line Items] |  |
Beginning Balance | 18,806 | 16,696
Goodwill acquired and/or adjusted | 7,322 | 2,110
Ending Balance | 26,128 | 18,806
Animal Safety |  |
Goodwill [Line Items] |  |
Beginning Balance | 51,313 | 51,494
Goodwill acquired and/or adjusted | 11,065 | (181)
Ending Balance | $ 62,378 | $ 51,313

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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=64834752&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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