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Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		9 Months Ended	12 Months Ended
	Nov. 30, 2018	Feb. 28, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017	Feb. 28, 2018	May 31, 2018	May 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 107,098	$ 94,903	$ 100,698	$ 206,724	$ 194,907	$ 289,811	$ 397,930	$ 358,277
Food Safety
Segment Reporting Information [Line Items]
Revenues	53,750		49,206	105,933	95,497
Animal Safety
Segment Reporting Information [Line Items]
Revenues	53,348		51,492	100,791	99,410
Product Revenues
Segment Reporting Information [Line Items]
Revenues	89,562	77,184	84,471	172,522	164,016	241,200	331,288	303,122
Product Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues					798,000
Product Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues					1,343,000
Service Revenues
Segment Reporting Information [Line Items]
Revenues	17,536	17,719	16,227	$ 34,202	30,891	48,611	66,642	55,155
Service Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues					0
Service Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues					25,000
Accounting Standards Update 2014-09 | Adjustments
Segment Reporting Information [Line Items]
Revenues		(989)	(1,119)		(2,166)	(3,154)	(4,322)	(3,317)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues
Segment Reporting Information [Line Items]
Revenues		(958)	$ (1,119)		(2,141)	(3,098)	(4,266)	(3,390)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues	354,000
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues	765,000
Accounting Standards Update 2014-09 | Adjustments | Service Revenues
Segment Reporting Information [Line Items]
Revenues		$ (31)			$ (25)	$ (56)	$ (56)	$ 73
Accounting Standards Update 2014-09 | Adjustments | Service Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues	$ 0

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