Deferred Commissions (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Apr. 30, 2019 |
Apr. 30, 2018 |
Jan. 31, 2019 |
|
| Revenue Recognition and Deferred Revenue [Abstract] | |||
| Deferred commissions | $ 31,823 | $ 29,014 | |
| Amortization of deferred commission costs | $ 3,858 | $ 1,997 | |
| Deferred commissions amortized period | 3 years | ||