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Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018	May 31, 2018	May 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 97,700	$ 94,903	$ 304,424	$ 289,811	$ 397,930	$ 358,277
Food Safety
Segment Reporting Information [Line Items]
Revenues	51,113	47,313	157,046	142,810
Animal Safety
Segment Reporting Information [Line Items]
Revenues	46,587	47,590	147,378	147,001
Product Revenues
Segment Reporting Information [Line Items]
Revenues	77,375	77,184	249,897	241,200	331,288	303,122
Product Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues				1,130,000
Product Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues				1,968,000
Service Revenues
Segment Reporting Information [Line Items]
Revenues	$ 20,325	17,719	$ 54,527	48,611	66,642	55,155
Service Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues		31,000		56,000
Accounting Standards Update 2014-09 | Adjustments
Segment Reporting Information [Line Items]
Revenues		(989)		(3,154)	(4,322)	(3,317)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues
Segment Reporting Information [Line Items]
Revenues		(958)		(3,098)	(4,266)	(3,390)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues		332,000
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues		626,000
Accounting Standards Update 2014-09 | Adjustments | Service Revenues
Segment Reporting Information [Line Items]
Revenues				$ (56)	$ (56)	$ 73

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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