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Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Aug. 31, 2023 | Aug. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | $ 228,987 | $ 132,349
Food Safety |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 166,278 | 64,643
Food Safety | Natural Toxins & Allergens |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 22,268 | 19,787
Food Safety | Bacterial & General Sanitation |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 45,224 | 10,728
Food Safety | Indicator Testing, Culture Media & Other |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 81,886 | 19,254
Food Safety | Rodenticides, Insecticides & Disinfectants |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 11,090 | 9,575
Food Safety | Genomics Services |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 5,810 | 5,299
Animal Safety |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 62,709 | 67,706
Animal Safety | Rodenticides, Insecticides & Disinfectants |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 22,686 | 22,214
Animal Safety | Genomics Services |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 17,255 | 18,704
Animal Safety | Life Sciences |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 1,661 | 1,589
Animal Safety | Veterinary Instruments & Disposables |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | 12,932 | 14,673
Animal Safety | Animal Care & Other |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenues, net | $ 8,175 | $ 10,526

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