Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Jan. 31, 2020
Property, Plant and Equipment [Line Items]
Sales commissions amortization period	5 years
Deferred commissions earned and capitalized	$ 4,200	$ 6,700
Amortization of deferred commissions	6,400	4,200
Depreciation and amortization expense	4,000	3,100
Capital lease amortization expense	1,000	$ 600
Property and equipment, net	36,274		$ 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	$ 14,900		$ 13,400