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Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Aug. 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2017	Feb. 28, 2018	May 31, 2018	May 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 99,626	$ 94,918	$ 100,667	$ 94,209	$ 194,876	$ 289,794	$ 397,913	$ 358,277
Food Safety
Segment Reporting Information [Line Items]
Revenues	52,183			46,291
Animal Safety
Segment Reporting Information [Line Items]
Revenues	47,443			47,918
Product Revenues
Segment Reporting Information [Line Items]
Revenues	82,960	77,168	84,472	79,545	164,017	241,184	331,272	303,221
Service Revenues
Segment Reporting Information [Line Items]
Revenues	$ 16,666	17,750	16,195	14,664	30,859	48,610	66,641	55,056
Accounting Standards Update 2014-09 | Adjustments
Segment Reporting Information [Line Items]
Revenues		(974)	(1,150)	(1,047)	(2,197)	(3,171)	(4,339)	(3,317)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues
Segment Reporting Information [Line Items]
Revenues		$ (974)	(1,118)	(1,022)	(2,140)	(3,114)	(4,282)	(3,291)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues				(443)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues				(579)
Accounting Standards Update 2014-09 | Adjustments | Service Revenues
Segment Reporting Information [Line Items]
Revenues			$ (32)	(25)	$ (57)	$ (57)	$ (57)	$ (26)
Accounting Standards Update 2014-09 | Adjustments | Service Revenues | Food Safety
Segment Reporting Information [Line Items]
Revenues				0
Accounting Standards Update 2014-09 | Adjustments | Service Revenues | Animal Safety
Segment Reporting Information [Line Items]
Revenues				$ (25)

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-Name Accounting Standards Codification
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