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Disaggregated Revenue (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
Disaggregation of Revenue [Line Items]
Total revenues	$ 107,098	$ 94,903	$ 100,698	$ 206,724	$ 194,907	$ 289,811	$ 397,930	$ 358,277
Food Safety
Disaggregation of Revenue [Line Items]
Total revenues	53,750		49,206	105,933	95,497
Food Safety | Natural Toxins, Allergens & Drug Residues
Disaggregation of Revenue [Line Items]
Total revenues	20,571		18,989	39,409	38,153
Food Safety | Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Total revenues	10,822		9,324	21,288	18,443
Food Safety | Culture Media & Other
Disaggregation of Revenue [Line Items]
Total revenues	12,191		11,041	24,408	21,173
Food Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total revenues	5,943		6,126	12,569	10,817
Food Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total revenues	4,223		3,726	8,259	6,911
Animal Safety
Disaggregation of Revenue [Line Items]
Total revenues	53,348		51,492	100,791	99,410
Animal Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total revenues	18,673		17,786	35,664	35,167
Animal Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total revenues	12,037		11,388	23,452	21,600
Animal Safety | Life Sciences
Disaggregation of Revenue [Line Items]
Total revenues	1,891		2,394	3,971	4,820
Animal Safety | Veterinary Instruments & Disposables
Disaggregation of Revenue [Line Items]
Total revenues	11,683		11,687	22,087	22,174
Animal Safety | Animal Care & Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 9,064		$ 8,237	$ 15,617	$ 15,649

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Name Accounting Standards Codification
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