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Segment Information (Parenthetical) (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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 107,098 | $ 94,903 | $ 100,698 | $ 206,724 | $ 194,907 | $ 289,811 | $ 397,930 | $ 358,277
Food Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 53,750 |  | 49,206 | 105,933 | 95,497 |  |  |
Animal Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 53,348 |  | 51,492 | 100,791 | 99,410 |  |  |
Product Revenues |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 89,562 | 77,184 | 84,471 | 172,522 | 164,016 | 241,200 | 331,288 | 303,122
Product Revenues | Food Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 798,000 |  |  |
Product Revenues | Animal Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 1,343,000 |  |  |
Service Revenues |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 17,536 | 17,719 | 16,227 | $ 34,202 | 30,891 | 48,611 | 66,642 | 55,155
Service Revenues | Food Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 0 |  |  |
Service Revenues | Animal Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 25,000 |  |  |
Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  | (989) | (1,119) |  | (2,166) | (3,154) | (4,322) | (3,317)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  | (958) | $ (1,119) |  | (2,141) | (3,098) | (4,266) | (3,390)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Food Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 354,000 |  |  |  |  |  |  |
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Animal Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | 765,000 |  |  |  |  |  |  |
Accounting Standards Update 2014-09 | Adjustments | Service Revenues |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues |  | $ (31) |  |  | $ (25) | $ (56) | $ (56) | $ 73
Accounting Standards Update 2014-09 | Adjustments | Service Revenues | Food Safety |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues | $ 0 |  |  |  |  |  |  |

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