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Other Assets - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jan. 31, 2019
Other Assets [Line Items]
Non-marketable equity and other investments	$ 61,258	$ 50,546
Prepayments for computing infrastructure platforms	11,612	16,976
Technology patents and other intangible assets, net	277,953	313,240
Deposits	4,010	4,383
Net deferred tax assets	4,495	4,544
Other	38,818	50,576
Total	138,895	147,360
Technology patents and other intangible assets, net
Other Assets [Line Items]
Technology patents and other intangible assets, net	$ 18,702	$ 20,335

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