Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 31, 2020	Apr. 30, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Property, Plant and Equipment [Line Items]
Sales commissions amortization period	5 years			5 years
Deferred commissions earned and capitalized	$ 13,100		$ 8,200	$ 32,800	$ 24,000
Amortization of deferred commissions	6,900		4,900	19,200	13,600
Depreciation and amortization expense	4,800		3,400	13,100	9,700
Capital lease amortization expense	1,300		$ 1,000	3,200	$ 2,600
Property and equipment, net	44,520			44,520		$ 34,879
Gain on termination of lease		$ 4,000
Gain on reversal of deferred rent		34,500
Impairment of property and equipment		20,700
Cash payments associated with termination and other fees		$ 9,800
Non-US
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 16,800			$ 16,800		$ 13,400