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Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018	Jan. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Non-marketable equity and other investments	$ 40,203	$ 29,205
Prepayments for computing infrastructure platform	10,738	13,588	$ 2,000
Technology patents, net	10,980	11,217
Acquired land leasehold interest, net	9,491	9,570
Deposits	4,966	4,492
Net deferred tax assets	3,726	1,884
Other	52,125	39,762
Total	$ 132,229	$ 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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Acquired Land Leasehold Interest, Net

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