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Disaggregated Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Disaggregation of Revenue [Line Items]
Total Revenues	$ 414,186	$ 397,930	$ 358,277
Percentage Increase Decrease In Revenue From Previous Period	4.00%	11.00%
Food Safety
Disaggregation of Revenue [Line Items]
Total Revenues	$ 213,474	$ 194,477	170,034
Percentage Increase Decrease In Revenue From Previous Period	10.00%	14.00%
Food Safety | Natural Toxins, Allergens & Drug Residues
Disaggregation of Revenue [Line Items]
Total Revenues	$ 78,373	$ 72,962	70,926
Percentage Increase Decrease In Revenue From Previous Period	7.00%	3.00%
Food Safety | Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Total Revenues	$ 41,966	$ 38,156	34,706
Percentage Increase Decrease In Revenue From Previous Period	10.00%	10.00%
Food Safety | Culture Media & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 49,857	$ 44,271	39,367
Percentage Increase Decrease In Revenue From Previous Period	13.00%	12.00%
Food Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total Revenues	$ 25,584	$ 23,821	13,620
Percentage Increase Decrease In Revenue From Previous Period	7.00%	75.00%
Food Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	$ 17,694	$ 15,267	11,415
Percentage Increase Decrease In Revenue From Previous Period	16.00%	34.00%
Animal Safety
Disaggregation of Revenue [Line Items]
Total Revenues	$ 200,712	$ 203,453	188,243
Percentage Increase Decrease In Revenue From Previous Period	(1.00%)	8.00%
Animal Safety | Life Sciences
Disaggregation of Revenue [Line Items]
Total Revenues	$ 7,858	$ 10,411	9,704
Percentage Increase Decrease In Revenue From Previous Period	(25.00%)	7.00%
Animal Safety | Animal Care & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 29,941	$ 30,930	27,891
Percentage Increase Decrease In Revenue From Previous Period	(3.00%)	11.00%
Animal Safety | Veterinary Instruments & Disposables
Disaggregation of Revenue [Line Items]
Total Revenues	$ 44,582	$ 47,749	41,693
Percentage Increase Decrease In Revenue From Previous Period	(7.00%)	15.00%
Animal Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total Revenues	$ 66,389	$ 67,646	69,429
Percentage Increase Decrease In Revenue From Previous Period	(2.00%)	(3.00%)
Animal Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	$ 51,942	$ 46,717	$ 39,526
Percentage Increase Decrease In Revenue From Previous Period	11.00%	18.00%

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