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Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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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