Employee Incentive Plans - Schedule of Common Stock Reserved for Future Issuance (Details)	Apr. 30, 2020 shares
Class of Stock [Line Items]
Common stock reserved for future issuance and options and unvested RSUs outstanding (in shares)	42,754,298
Stock Options And Restricted Stock Units
Class of Stock [Line Items]
Stock options and unvested RSUs outstanding (in shares)	16,057,236
Common stock, reserved for future issuance (in shares)	21,816,827
ESPP
Class of Stock [Line Items]
Common stock, reserved for future issuance (in shares)	4,880,235