Convertible Preferred Stock, Stockholders’ Equity (Deficit) and Equity Incentive Plan - Fair Value of ESPP Purchase Rights Assumptions (Details) - Purchase rights committed under the ESPP |
3 Months Ended | 12 Months Ended |
|---|---|---|
Jan. 31, 2020 |
Jan. 31, 2020 |
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected volatility, minimum | 40.30% | |
| Expected volatility, maximum | 56.20% | |
| Risk-free interest rate, minimum | 1.50% | |
| Risk-free interest rate, maximum | 2.50% | |
| Expected dividend yield | 0.00% | |
| Minimum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected term (years) | 6 months | |
| Maximum | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Expected term (years) | 2 years 1 month 6 days |