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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2019	May 31, 2018
Goodwill [Line Items]
Beginning Balance		$ 99,558	$ 104,759
Goodwill acquired		4,992	757
Goodwill adjustments and/or currency	[1]	(931)	(5,958)
Ending Balance		103,619	99,558
Food Safety
Goodwill [Line Items]
Beginning Balance		40,001	45,920
Goodwill acquired		3,796
Goodwill adjustments and/or currency	[1]	(1,244)	(5,919)
Ending Balance		42,553	40,001
Animal Safety
Goodwill [Line Items]
Beginning Balance		59,557	58,839
Goodwill acquired		1,196	757
Goodwill adjustments and/or currency	[1]	313	(39)
Ending Balance		$ 61,066	$ 59,557
[1] Includes 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.

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