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Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Nov. 30, 2018 | Nov. 30, 2017 | Feb. 28, 2018 | May 31, 2018 | May 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | $ 107,098 | $ 94,903 | $ 100,698 | $ 206,724 | $ 194,907 | $ 289,811 | $ 397,930 | $ 358,277
Food Safety |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 53,750 |  | 49,206 | 105,933 | 95,497 |  |  |
Food Safety | Natural Toxins, Allergens & Drug Residues |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 20,571 |  | 18,989 | 39,409 | 38,153 |  |  |
Food Safety | Bacterial & General Sanitation |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 10,822 |  | 9,324 | 21,288 | 18,443 |  |  |
Food Safety | Culture Media & Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 12,191 |  | 11,041 | 24,408 | 21,173 |  |  |
Food Safety | Rodenticides, Insecticides & Disinfectants |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 5,943 |  | 6,126 | 12,569 | 10,817 |  |  |
Food Safety | Genomics Services |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 4,223 |  | 3,726 | 8,259 | 6,911 |  |  |
Animal Safety |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 53,348 |  | 51,492 | 100,791 | 99,410 |  |  |
Animal Safety | Rodenticides, Insecticides & Disinfectants |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 18,673 |  | 17,786 | 35,664 | 35,167 |  |  |
Animal Safety | Genomics Services |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 12,037 |  | 11,388 | 23,452 | 21,600 |  |  |
Animal Safety | Life Sciences |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 1,891 |  | 2,394 | 3,971 | 4,820 |  |  |
Animal Safety | Veterinary Instruments & Disposables |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | 11,683 |  | 11,687 | 22,087 | 22,174 |  |  |
Animal Safety | Animal Care & Other |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Total revenues | $ 9,064 |  | $ 8,237 | $ 15,617 | $ 15,649 |  |  |

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