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Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands | Apr. 30, 2018 | Jan. 31, 2018 | Jan. 31, 2014
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Non-marketable equity and other investments | $ 31,605 | $ 29,205 |
Prepayments for computing infrastructure platform | 11,403 | 13,588 | $ 2,000
Technology patents, net | 10,790 | 11,217 |
Acquired land leasehold interest, net | 9,544 | 9,570 |
Deposits | 4,731 | 4,492 |
Net deferred tax assets | 2,097 | 1,884 |
Other | 40,768 | 39,762 |
Total | $ 110,938 | $ 109,718 |

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