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

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
-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

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- Definition

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+ References

No definition available.

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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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