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Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 527,159 | $ 468,459 | $ 418,170
Food Safety |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 259,979 | 234,244 | 212,691
Food Safety | Natural Toxins, Allergens & Drug Residues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 79,395 | 76,614 | 76,207
Food Safety | Bacterial & General Sanitation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 47,282 | 44,009 | 41,780
Food Safety | Culture Media & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 75,278 | 61,245 | 47,847
Food Safety | Rodenticides, Insecticides & Disinfectants |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 35,691 | 32,219 | 28,890
Food Safety | Genomics Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 22,333 | 20,157 | 17,967
Animal Safety |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 267,180 | 234,215 | 205,479
Animal Safety | Life Sciences |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 5,685 | 5,715 | 6,322
Animal Safety | Animal Care & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 39,805 | 35,897 | 28,389
Animal Safety | Veterinary Instruments & Disposables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 63,938 | 48,128 | 42,941
Animal Safety | Rodenticides, Insecticides & Disinfectants |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | 83,610 | 77,458 | 68,815
Animal Safety | Genomics Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 74,142 | $ 67,017 | $ 59,012

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