Equity - Shares Reserved For Future Issuance (Details) - shares	Oct. 31, 2021	Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	111,787,754	112,494,580
Employee stock purchase rights under the 2020 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	8,208,724	5,700,000
2012 Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	47,781,688	64,574,656
2012 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	5,034,800	7,520,474
2020 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	5,081,153	1,828,083
2020 Plan | Shares available for future grants
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	45,681,389	32,871,367