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Disaggregated Revenue (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
Disaggregation of Revenue [Line Items]
Total revenues	$ 99,626	$ 94,918	$ 100,667	$ 94,209	$ 194,876	$ 289,794	$ 397,913	$ 358,277
Food Safety
Disaggregation of Revenue [Line Items]
Total revenues	52,183			46,291
Food Safety | Natural Toxins, Allergens & Drug Residues
Disaggregation of Revenue [Line Items]
Total revenues	18,838			19,163
Food Safety | Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Total revenues	10,467			9,119
Food Safety | Dehydrated Culture Media & Other
Disaggregation of Revenue [Line Items]
Total revenues	12,217			10,134
Food Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total revenues	6,625			4,690
Food Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total revenues	4,036			3,185
Animal Safety
Disaggregation of Revenue [Line Items]
Total revenues	47,443			47,918
Animal Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total revenues	16,991			17,381
Animal Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total revenues	11,415			10,212
Animal Safety | Life Sciences
Disaggregation of Revenue [Line Items]
Total revenues	2,080			2,427
Animal Safety | Veterinary Instruments & Disposables
Disaggregation of Revenue [Line Items]
Total revenues	10,404			10,487
Animal Safety | Animal Care & Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 6,553			$ 7,411

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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