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Summary of Unaudited Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2019 | May 31, 2018 | May 31, 2017
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 414,186 | $ 397,930 | $ 358,277
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  | 222,266 | 211,658 | 189,353
Gross margin | $ 50,530 | $ 44,628 | $ 50,033 | $ 46,729 | $ 48,498 | $ 44,601 | $ 48,249 | $ 44,924 | 191,920 | 186,272 | 168,924
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  | 70,230 | 66,929 | 59,380
Total operating expenses |  |  |  |  |  |  |  |  | 123,826 | 116,078 | 103,979
Operating income |  |  |  |  |  |  |  |  | 68,094 | 70,194 | 64,945
Product Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 339,439 | 331,288 | 303,148
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  | 179,660 | 173,725 | 156,295
Service Revenues |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 74,747 | 66,642 | 55,129
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  | $ 42,606 | 37,933 | 33,058
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 402,252 | 361,594
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 212,000 | 189,626
Gross margin |  |  |  |  |  |  |  |  |  | 190,252 | 171,968
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  | 70,909 | 62,424
Total operating expenses |  |  |  |  |  |  |  |  |  | 120,058 | 107,023
Operating income |  |  |  |  |  |  |  |  |  | 70,194 | 64,945
Accounting Standards Update 2014-09 | Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | (4,322) | (3,317)
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | (342) | (273)
Gross margin |  |  |  |  |  |  |  |  |  | (3,980) | (3,044)
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  | (3,980) | (3,044)
Total operating expenses |  |  |  |  |  |  |  |  |  | (3,980) | (3,044)
Accounting Standards Update 2014-09 | Product Revenues | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 335,554 | 306,512
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 174,067 | 156,568
Accounting Standards Update 2014-09 | Product Revenues | Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | (4,266) | (3,390)
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | (342) | (273)
Accounting Standards Update 2014-09 | Service Revenues | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 66,698 | 55,082
Cost of revenues |  |  |  |  |  |  |  |  |  |  |
Total cost of revenues |  |  |  |  |  |  |  |  |  | 37,933 | 33,058
Accounting Standards Update 2014-09 | Service Revenues | Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ (56) | $ 73

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