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Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018	Jan. 31, 2014
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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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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-Publisher FASB
-Name Accounting Standards Codification
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