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Geographic Information Summary of Revenues by Geographic Area (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2019 USD ($) market | Jul. 31, 2018 USD ($) | Jul. 31, 2019 USD ($) market | Jul. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |
Number of primary geographical markets | market | 2 |  | 2 |
Revenue | $ 887,752 | $ 671,720 | $ 1,712,807 | $ 1,290,363
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 676,568 | 515,257 | 1,305,097 | 995,339
Other countries |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 211,184 | $ 156,463 | $ 407,710 | $ 295,024

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