Balance Sheet Components - Schedule of Property and Equipment Net (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Jan. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 151,727	$ 84,394
Less: Accumulated depreciation	(43,650)	(27,256)
Property and equipment, net	108,077	57,138
Computer and office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	94,822	51,375
Software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,586	10,855
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	22,325	18,215
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,994	$ 3,949