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Disaggregated Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Disaggregation of Revenue [Line Items]
Total Revenues	$ 418,170	$ 414,186	$ 397,930
Percentage Increase Decrease In Revenue From Previous Period	1.00%	4.00%
Food Safety
Disaggregation of Revenue [Line Items]
Total Revenues	$ 212,691	$ 213,474	194,477
Percentage Increase Decrease In Revenue From Previous Period	0.00%	10.00%
Food Safety | Natural Toxins, Allergens & Drug Residues
Disaggregation of Revenue [Line Items]
Total Revenues	$ 76,207	$ 78,373	72,962
Percentage Increase Decrease In Revenue From Previous Period	(3.00%)	7.00%
Food Safety | Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Total Revenues	$ 41,780	$ 41,966	38,156
Percentage Increase Decrease In Revenue From Previous Period	0.00%	10.00%
Food Safety | Culture Media & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 47,847	$ 49,857	44,271
Percentage Increase Decrease In Revenue From Previous Period	(4.00%)	13.00%
Food Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total Revenues	$ 28,890	$ 25,584	23,821
Percentage Increase Decrease In Revenue From Previous Period	13.00%	7.00%
Food Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	$ 17,967	$ 17,694	15,267
Percentage Increase Decrease In Revenue From Previous Period	2.00%	16.00%
Animal Safety
Disaggregation of Revenue [Line Items]
Total Revenues	$ 205,479	$ 200,712	203,453
Percentage Increase Decrease In Revenue From Previous Period	2.00%	(1.00%)
Animal Safety | Life Sciences
Disaggregation of Revenue [Line Items]
Total Revenues	$ 6,322	$ 7,858	10,411
Percentage Increase Decrease In Revenue From Previous Period	(20.00%)	(25.00%)
Animal Safety | Animal Care & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 28,389	$ 29,941	30,930
Percentage Increase Decrease In Revenue From Previous Period	(5.00%)	(3.00%)
Animal Safety | Veterinary Instruments & Disposables
Disaggregation of Revenue [Line Items]
Total Revenues	$ 42,941	$ 44,582	47,749
Percentage Increase Decrease In Revenue From Previous Period	(4.00%)	(7.00%)
Animal Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total Revenues	$ 68,815	$ 66,389	67,646
Percentage Increase Decrease In Revenue From Previous Period	4.00%	(2.00%)
Animal Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	$ 59,012	$ 51,942	$ 46,717
Percentage Increase Decrease In Revenue From Previous Period	14.00%	11.00%

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