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Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2022 | Aug. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Total Revenues | $ 132,349 | $ 128,305
Food Safety |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 64,643 | 62,722
Food Safety | Natural Toxins, Allergens & Drug Residues |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 19,787 | 20,408
Food Safety | Bacterial & General Sanitation |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 10,728 | 11,165
Food Safety | Culture Media & Other |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 19,254 | 18,046
Food Safety | Rodent Control, Insect Control & Disinfectants |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 9,575 | 7,649
Food Safety | Genomics Services |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 5,299 | 5,454
Animal Safety |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 67,706 | 65,583
Animal Safety | Rodent Control, Insect Control & Disinfectants |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 22,214 | 22,149
Animal Safety | Genomics Services |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 18,704 | 17,515
Animal Safety | Life Sciences |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 1,589 | 1,363
Animal Safety | Veterinary Instruments & Disposables |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | 14,673 | 15,337
Animal Safety | Animal Care & Other |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues | $ 10,526 | $ 9,219

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