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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2020	May 31, 2019
Goodwill [Line Items]
Beginning Balance		$ 103,619	$ 99,558
Goodwill acquired		8,349	4,992
Goodwill and/or currency adjustments	[1]	(1,628)	(931)
Ending Balance		110,340	103,619
Food Safety
Goodwill [Line Items]
Beginning Balance		42,553	40,001
Goodwill acquired		6,254	3,796
Goodwill and/or currency adjustments	[1]	(1,592)	(1,244)
Ending Balance		47,215	42,553
Animal Safety
Goodwill [Line Items]
Beginning Balance		61,066	59,557
Goodwill acquired		2,095	1,196
Goodwill and/or currency adjustments	[1]	(36)	313
Ending Balance		$ 63,125	$ 61,066
[1] Includes final purchase price allocation adjustments and currency adjustments for goodwill recorded at international locations.

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.

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