Stock-Based Compensation (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jul. 31, 2018 |
Jul. 31, 2017 |
Jul. 31, 2018 |
Jul. 31, 2017 |
| Share-based Compensation Arrangement by Share-based Payment Award |
|
|
|
|
| Stock-based compensation expense |
$ 7,968
|
$ 7,974
|
$ 15,555
|
$ 12,892
|
| Number of Shares Authorized |
2,000,000
|
|
2,000,000
|
|
| Maximum |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award |
|
|
|
|
| Award Vesting Period |
|
|
3 years
|
|
| Minimum |
|
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award |
|
|
|
|
| Award Vesting Period |
|
|
1 year
|
|
| Restricted Stock Units (RSUs) |
|
|
|
|
| Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares |
|
|
|
|
| Nonvested at January 31, 2018 |
|
|
700,532
|
|
| Granted |
|
|
272,849
|
|
| Vested |
|
|
(252,830)
|
|
| Canceled |
|
|
(36,051)
|
|
| Nonvested at July 31, 2018 |
684,500
|
|
684,500
|
|
| Performance Based Restricted Stock Units (PSRUs) |
|
|
|
|
| Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares |
|
|
|
|
| Nonvested at January 31, 2018 |
|
|
170,685
|
|
| Granted |
|
|
153,719
|
|
| Canceled |
|
|
(19,786)
|
|
| Nonvested at July 31, 2018 |
304,618
|
|
304,618
|
|