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Disaggregated Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Disaggregation of Revenue [Line Items]
Total Revenues	$ 468,459	$ 418,170	$ 414,186
Percentage Increase Decrease In Revenue From Previous Period	12.00%	1.00%
Food Safety
Disaggregation of Revenue [Line Items]
Total Revenues	$ 234,244	$ 212,691	213,474
Percentage Increase Decrease In Revenue From Previous Period	10.00%	0.00%
Food Safety | Natural Toxins, Allergens & Drug Residues
Disaggregation of Revenue [Line Items]
Total Revenues	$ 76,614	$ 76,207	78,373
Percentage Increase Decrease In Revenue From Previous Period	1.00%	(3.00%)
Food Safety | Bacterial & General Sanitation
Disaggregation of Revenue [Line Items]
Total Revenues	$ 44,009	$ 41,780	41,966
Percentage Increase Decrease In Revenue From Previous Period	5.00%	0.00%
Food Safety | Culture Media & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 56,922	$ 47,847	49,857
Percentage Increase Decrease In Revenue From Previous Period	19.00%	(4.00%)
Food Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total Revenues	$ 36,542	$ 28,890	25,584
Percentage Increase Decrease In Revenue From Previous Period	26.00%	13.00%
Food Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	$ 20,157	$ 17,967	17,694
Percentage Increase Decrease In Revenue From Previous Period	12.00%	2.00%
Animal Safety
Disaggregation of Revenue [Line Items]
Total Revenues	$ 234,215	$ 205,479	200,712
Percentage Increase Decrease In Revenue From Previous Period	14.00%	2.00%
Animal Safety | Life Sciences
Disaggregation of Revenue [Line Items]
Total Revenues	$ 5,715	$ 6,322	7,858
Percentage Increase Decrease In Revenue From Previous Period	(10.00%)	(20.00%)
Animal Safety | Animal Care & Other
Disaggregation of Revenue [Line Items]
Total Revenues	$ 35,897	$ 28,389	29,941
Percentage Increase Decrease In Revenue From Previous Period	26.00%	(5.00%)
Animal Safety | Veterinary Instruments & Disposables
Disaggregation of Revenue [Line Items]
Total Revenues	$ 48,128	$ 42,941	44,582
Percentage Increase Decrease In Revenue From Previous Period	12.00%	(4.00%)
Animal Safety | Rodenticides, Insecticides & Disinfectants
Disaggregation of Revenue [Line Items]
Total Revenues	$ 77,458	$ 68,815	66,389
Percentage Increase Decrease In Revenue From Previous Period	13.00%	4.00%
Animal Safety | Genomics Services
Disaggregation of Revenue [Line Items]
Total Revenues	$ 67,017	$ 59,012	$ 51,942
Percentage Increase Decrease In Revenue From Previous Period	14.00%	14.00%

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