Balance Sheet Components - Schedule of Information About Contracts with Customers (Details)) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020	Oct. 31, 2019	Apr. 30, 2019
Contract Balances [Line Items]
Unbilled accounts receivable, included in accounts receivable, net	$ 3,046	$ 2,622	$ 2,630	$ 1,710
Deferred revenue	309,216	259,702	$ 201,331	$ 170,666
Contracts with Customers
Contract Balances [Line Items]
Unbilled accounts receivable, included in accounts receivable, net	3,046	2,622
Deferred contract acquisition costs	64,483	43,549
Deferred revenue	$ 309,216	$ 259,702