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Revenue Recognition - Summary of Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 28, 2025 | Feb. 29, 2024 | Feb. 28, 2025 | Feb. 29, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 220,980 | $ 228,812 | $ 669,202 | $ 687,428
Food Safety |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 152,731 | 157,754 | 476,314 | 488,435
Food Safety | Natural Toxins & Allergens |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 17,595 | 19,738 | 58,479 | 63,116
Food Safety | Bacterial & General Sanitation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 39,882 | 40,395 | 122,317 | 128,393
Food Safety | Indicator Testing, Culture Media & Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 77,744 | 81,168 | 242,710 | 246,812
Food Safety | Biosecurity Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 11,815 | 10,136 | 35,717 | 32,180
Food Safety | Genomics Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 5,695 | 18,589 | 17,091 | 53,518
Animal Safety |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 68,249 | 71,058 | 192,888 | 198,993
Animal Safety | Biosecurity Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 23,827 | 23,055 | 66,557 | 65,694
Animal Safety | Genomics Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 17,009 | 6,317 | 49,307 | 17,934
Animal Safety | Life Sciences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 1,504 | 1,372 | 4,864 | 4,710
Animal Safety | Veterinary Instruments & Disposables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 15,412 | 17,976 | 45,209 | 47,845
Animal Safety | Animal Care & Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 10,497 | $ 10,066 | $ 26,951 | $ 27,226

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