Other Assets (Schedule of Other Assets) (Detail) - USD ($) $ in Thousands	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2014
Other Assets [Line Items]
Non-marketable equity and other investments	$ 50,546	$ 29,205
Prepayments for computing infrastructure platforms	16,976	13,588	$ 2,000
Technology patents, net	313,240	34,234
Acquired land leasehold interest, net	9,465	9,570
Deposits	4,383	4,492
Net deferred tax assets	4,544	1,884
Other	42,030	39,762
Total	147,360	109,718
Technology patents, net
Other Assets [Line Items]
Technology patents, net	$ 19,416	$ 11,217

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.

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