Employee Incentive Plans - Schedule of Common Stock Reserved for Future Issuance (Details)	Oct. 31, 2020 shares
Class of Stock [Line Items]
Common stock reserved for future issuance and options and unvested RSUs outstanding (in shares)	39,541,878
Stock Options and Restricted Stock Units
Class of Stock [Line Items]
Stock options and unvested RSUs outstanding (in shares)	14,069,326
Common stock, reserved for future issuance (in shares)	20,720,051
ESPP
Class of Stock [Line Items]
Common stock, reserved for future issuance (in shares)	4,752,501