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Goodwill By Business Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014
Goodwill [Line Items] |  |
Beginning Balance | $ 68,190 | $ 59,491
Goodwill acquired and/or adjusted | 1,929 | 8,699
Ending Balance | 70,119 | 68,190
Food Safety |  |
Goodwill [Line Items] |  |
Beginning Balance | 16,696 | 16,696
Goodwill acquired and/or adjusted | 2,110 | 0
Ending Balance | 18,806 | 16,696
Animal Safety |  |
Goodwill [Line Items] |  |
Beginning Balance | 51,494 | 42,795
Goodwill acquired and/or adjusted | (181) | 8,699
Ending Balance | $ 51,313 | $ 51,494

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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 -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 + 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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