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