Summary of Significant Accounting Policies - Property and Equipment, Net (Details) |
12 Months Ended |
|---|---|
Jan. 31, 2020 | |
| Furniture and equipment | |
| Property, Plant and Equipment [Line Items] | |
| Useful life | 5 years |
| Capitalized internal-use software | |
| Property, Plant and Equipment [Line Items] | |
| Useful life | 3 years |
| Minimum | Data center and other computer equipment | |
| Property, Plant and Equipment [Line Items] | |
| Useful life | 3 years |
| Minimum | Purchased software | |
| Property, Plant and Equipment [Line Items] | |
| Useful life | 3 years |
| Maximum | Data center and other computer equipment | |
| Property, Plant and Equipment [Line Items] | |
| Useful life | 5 years |
| Maximum | Purchased software | |
| Property, Plant and Equipment [Line Items] | |
| Useful life | 5 years |