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Summary of Unaudited Consolidated Statement of Income (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
Revenues |  |  |  |  |  |  |  |
Total revenues | $ 97,700 | $ 94,903 |  | $ 304,424 | $ 289,811 |  | $ 397,930 | $ 358,277
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues | 53,072 | 50,302 |  | 163,034 | 152,037 |  | 211,658 | 189,353
Gross margin | 44,628 | 44,601 |  | 141,390 | 137,774 |  | 186,272 | 168,924
Operating Expenses |  |  |  |  |  |  |  |
Sales and marketing | 16,722 | 16,572 |  | 52,454 | 49,442 |  | 66,929 | 59,380
Total operating expenses | 29,989 | 28,688 |  | 92,026 | 87,439 |  | 116,078 | 103,979
Operating income | 14,639 | 15,913 | [1] | 49,364 | 50,335 | [2] | 70,194 | 64,945
Product Revenues |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues | 77,375 | 77,184 |  | 249,897 | 241,200 |  | 331,288 | 303,122
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues | 41,902 | 40,283 |  | 132,157 | 124,520 |  | 173,725 | 156,295
Service Revenues |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues | 20,325 | 17,719 |  | 54,527 | 48,611 |  | 66,642 | 55,155
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues | $ 11,170 | 10,019 |  | $ 30,877 | 27,517 |  | 37,933 | 33,058
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues |  | 95,892 |  |  | 292,965 |  | 402,252 | 361,594
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues |  | 50,371 |  |  | 152,302 |  | 212,000 | 189,626
Gross margin |  | 45,521 |  |  | 140,663 |  | 190,252 | 171,968
Operating Expenses |  |  |  |  |  |  |  |
Sales and marketing |  | 17,492 |  |  | 52,331 |  | 70,909 | 62,424
Total operating expenses |  | 29,608 |  |  | 90,328 |  | 120,058 | 107,023
Operating income |  | 15,913 |  |  | 50,335 |  | 70,194 | 64,945
Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues |  | (989) |  |  | (3,154) |  | (4,322) | (3,317)
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues |  | (69) |  |  | (265) |  | (342) | (273)
Gross margin |  | (920) |  |  | (2,889) |  | (3,980) | (3,044)
Operating Expenses |  |  |  |  |  |  |  |
Sales and marketing |  | (920) |  |  | (2,889) |  | (3,980) | (3,044)
Total operating expenses |  | (920) |  |  | (2,889) |  | (3,980) | (3,044)
Accounting Standards Update 2014-09 | Product Revenues | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues |  | 78,142 |  |  | 244,298 |  | 335,554 | 306,512
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues |  | 40,352 |  |  | 124,785 |  | 174,067 | 156,568
Accounting Standards Update 2014-09 | Product Revenues | Adjustments |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues |  | (958) |  |  | (3,098) |  | (4,266) | (3,390)
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues |  | (69) |  |  | (265) |  | (342) | (273)
Accounting Standards Update 2014-09 | Service Revenues | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues |  | 17,750 |  |  | 48,667 |  | 66,698 | 55,082
Cost of revenues |  |  |  |  |  |  |  |
Total cost of revenues |  | 10,019 |  |  | 27,517 |  | 37,933 | 33,058
Accounting Standards Update 2014-09 | Service Revenues | Adjustments |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |
Total revenues |  |  |  |  | $ (56) |  | $ (56) | $ 73
[1] | Revenues for the three months ended February 28, 2018 have been revised as discussed in Note 1. For the three months ended February 28, 2018, product revenues were reduced by $332,000 in the Food Safety segment and $626,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and were reduced by $31,000 in the Animal Safety segment.
[2] | Revenues for the nine months ended February 28, 2018 have been revised as discussed in Note 1. For the nine months ended February 28, 2018, product revenues were reduced by $1,130,000 in the Food Safety segment and $1,968,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and reduced by $56,000 in the Animal Safety segment.

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