Equity - Shares Reserved For Future Issuance (Details) - shares	Jul. 31, 2021	Jan. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	117,102,337	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)	8,320,369	5,700,000
2012 Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	52,250,088	64,574,656
2012 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	6,082,830	7,520,474
2020 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	4,680,406	1,828,083
2020 Plan | Pool
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	45,768,644	32,871,367