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Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 414,186 | $ 397,930 | $ 358,277
Percentage Increase Decrease In Revenue From Previous Period | 4.00% | 11.00% |
Food Safety |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 213,474 | $ 194,477 | 170,034
Percentage Increase Decrease In Revenue From Previous Period | 10.00% | 14.00% |
Food Safety | Natural Toxins, Allergens & Drug Residues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 78,373 | $ 72,962 | 70,926
Percentage Increase Decrease In Revenue From Previous Period | 7.00% | 3.00% |
Food Safety | Bacterial & General Sanitation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 41,966 | $ 38,156 | 34,706
Percentage Increase Decrease In Revenue From Previous Period | 10.00% | 10.00% |
Food Safety | Culture Media & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 49,857 | $ 44,271 | 39,367
Percentage Increase Decrease In Revenue From Previous Period | 13.00% | 12.00% |
Food Safety | Rodenticides, Insecticides & Disinfectants |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 25,584 | $ 23,821 | 13,620
Percentage Increase Decrease In Revenue From Previous Period | 7.00% | 75.00% |
Food Safety | Genomics Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 17,694 | $ 15,267 | 11,415
Percentage Increase Decrease In Revenue From Previous Period | 16.00% | 34.00% |
Animal Safety |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 200,712 | $ 203,453 | 188,243
Percentage Increase Decrease In Revenue From Previous Period | (1.00%) | 8.00% |
Animal Safety | Life Sciences |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 7,858 | $ 10,411 | 9,704
Percentage Increase Decrease In Revenue From Previous Period | (25.00%) | 7.00% |
Animal Safety | Animal Care & Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 29,941 | $ 30,930 | 27,891
Percentage Increase Decrease In Revenue From Previous Period | (3.00%) | 11.00% |
Animal Safety | Veterinary Instruments & Disposables |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 44,582 | $ 47,749 | 41,693
Percentage Increase Decrease In Revenue From Previous Period | (7.00%) | 15.00% |
Animal Safety | Rodenticides, Insecticides & Disinfectants |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 66,389 | $ 67,646 | 69,429
Percentage Increase Decrease In Revenue From Previous Period | (2.00%) | (3.00%) |
Animal Safety | Genomics Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenues | $ 51,942 | $ 46,717 | $ 39,526
Percentage Increase Decrease In Revenue From Previous Period | 11.00% | 18.00% |

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