Stockholders' Equity and Equity Incentive Plans - Schedule of Stock by Class Reserved for Future Issuance (Details) - shares	Jan. 31, 2022	Jan. 31, 2021
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	80,832,845	68,708,474
Stock options
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	6,195,205	9,239,504
RSUs
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	5,546,366	4,510,730
ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	1,784,687	724,883
2011 and 2019 Plan
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	56,620,720	44,584,783
2019 Employee Stock Purchase Plan | ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	10,685,867	9,648,574