Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jan. 31, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 185,742	$ 100,423
Less: Accumulated depreciation and amortization	(49,664)	(26,688)
Property and equipment, net	136,078	73,735
Data center and other computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	87,166	44,735
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,354	22,209
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,157	10,011
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,604	1,460
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,835	2,553
Construction in process
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 47,626	$ 19,455

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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