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Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2022 | Nov. 30, 2021 | Nov. 30, 2022 | Nov. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 230,033 | $ 130,517 | $ 362,382 | $ 258,822
Food Safety |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 161,343 | 67,132 | 225,986 | 129,854
Food Safety | Natural Toxins, Allergens & Drug Residues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 22,251 | 21,028 | 42,038 | 41,432
Food Safety | Bacterial & General Sanitation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 41,121 | 12,252 | 51,849 | 23,421
Food Safety | Culture Media & Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 82,084 | 19,935 | 101,338 | 37,981
Food Safety | Rodent Control, Insect Control & Disinfectants |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 10,377 | 8,232 | 19,952 | 15,882
Food Safety | Genomics Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 5,510 | 5,685 | 10,809 | 11,138
Animal Safety |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 68,690 | 63,385 | 136,396 | 128,968
Animal Safety | Rodent Control, Insect Control & Disinfectants |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 20,665 | 18,269 | 42,879 | 40,418
Animal Safety | Genomics Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 19,596 | 17,386 | 38,300 | 34,901
Animal Safety | Life Sciences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 1,427 | 1,309 | 3,016 | 2,672
Animal Safety | Veterinary Instruments & Disposables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 16,433 | 15,572 | 31,106 | 30,909
Animal Safety | Animal Care & Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 10,569 | $ 10,849 | $ 21,095 | $ 20,068

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