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Goodwill By Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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+ References

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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

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