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Segment Information (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018 | May 31, 2018 | May 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | $ 97,700 | $ 94,903 | $ 304,424 | $ 289,811 | $ 397,930 | $ 358,277
Food Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 51,113 | 47,313 | 157,046 | 142,810 |  |
Animal Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 46,587 | 47,590 | 147,378 | 147,001 |  |
Product Revenues |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | 77,375 | 77,184 | 249,897 | 241,200 | 331,288 | 303,122
Product Revenues | Food Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 1,130,000 |  |
Product Revenues | Animal Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  |  |  | 1,968,000 |  |
Service Revenues |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues | $ 20,325 | 17,719 | $ 54,527 | 48,611 | 66,642 | 55,155
Service Revenues | Animal Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 31,000 |  | 56,000 |  |
Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | (989) |  | (3,154) | (4,322) | (3,317)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | (958) |  | (3,098) | (4,266) | (3,390)
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Food Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 332,000 |  |  |  |
Accounting Standards Update 2014-09 | Adjustments | Product Revenues | Animal Safety |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  | 626,000 |  |  |  |
Accounting Standards Update 2014-09 | Adjustments | Service Revenues |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Revenues |  |  |  | $ (56) | $ (56) | $ 73

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