Revenue and Performance Obligations - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Disaggregation of Revenue [Line Items] | ||
| Remaining performance obligations | $ 574.0 | |
| Subscription | Minimum | ||
| Disaggregation of Revenue [Line Items] | ||
| Contract term | 1 year | |
| Subscription | Maximum | ||
| Disaggregation of Revenue [Line Items] | ||
| Contract term | 3 years | |
| Product concentration risk | Revenue | Subscription | ||
| Disaggregation of Revenue [Line Items] | ||
| Concentration risk percentage | 94.00% | 95.00% |