Income Taxes (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
|
| Income Tax Disclosure [Abstract] | ||
| Provision (benefit) for income taxes | $ (138) | $ 467 |
| Unrecognized tax benefits | 4,600 | |
| Unrecognized tax benefits that would impact effective tax rate | 100 | |
| Decrease in unrecognized tax benefits is reasonably possible | $ 0 | |