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Goodwill by Business Segment (Detail) - USD ($) $ in Thousands		12 Months Ended
		May 31, 2021	May 31, 2020
Goodwill [Line Items]
Beginning Balance		$ 110,340	$ 103,619
Goodwill acquired		18,775	8,349
Goodwill and/or currency adjustments	[1]	2,361	(1,628)
Ending Balance		131,476	110,340
Food Safety
Goodwill [Line Items]
Beginning Balance		47,215	42,553
Goodwill acquired		18,775	6,254
Goodwill and/or currency adjustments	[1]	1,832	(1,592)
Ending Balance		67,822	47,215
Animal Safety
Goodwill [Line Items]
Beginning Balance		63,125	61,066
Goodwill acquired		0	2,095
Goodwill and/or currency adjustments	[1]	529	(36)
Ending Balance		$ 63,654	$ 63,125
[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.

+ References

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