Share-Based Compensation - Restricted Stock Units (Details) - RSUs |
3 Months Ended |
|---|---|
|
Apr. 30, 2019
$ / shares
shares
| |
| Number of Shares Underlying Outstanding RSUs | |
| Outstanding beginning balance (in shares) | shares | 845,199 |
| Granted (in shares) | shares | 1,524,826 |
| Vested (in shares) | shares | (70,833) |
| Forfeited or canceled (in shares) | shares | (31,223) |
| Outstanding ending balance (in shares) | shares | 2,267,969 |
| Weighted-Average Grant-Date Fair Value per RSU | |
| Outstanding beginning balance (in dollars per share) | $ / shares | $ 24.17 |
| Granted (in dollars per share) | $ / shares | 39.89 |
| Vested (in dollars per share) | $ / shares | 14.15 |
| Forfeited or canceled (in dollars per share) | $ / shares | 32.17 |
| Outstanding ending balance (in dollars per share) | $ / shares | $ 34.94 |