STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - RESTRICTED STOCK UNITS (Details) $ / shares in Units, $ in Millions |
3 Months Ended |
|---|---|
|
Apr. 30, 2018
USD ($)
$ / shares
shares
| |
| RSUs | |
| Summary of award activity | |
| Beginning balance (in shares) | 2,808,000 |
| Granted (in shares) | 1,324,000 |
| Released (in shares) | (180,000) |
| Forfeited (in shares) | (100,000) |
| Ending balance (in shares) | 3,852,000 |
| Weighted-Average Grant-Date Fair Value | |
| Beginning balance (in dollars per share) | $ / shares | $ 41.18 |
| Granted (in dollars per share) | $ / shares | 42.39 |
| Released (in dollars per share) | $ / shares | 38.65 |
| Forfeited (in dollars per share) | $ / shares | 42.11 |
| Ending balance (in dollars per share) | $ / shares | $ 41.69 |
| Additional disclosures | |
| Unrecognized compensation expense | $ | $ 100.0 |
| Remaining weighted-average vesting period over which expense is expected to be recognized (in years) | 2 years |
| RSUs, Excluding PSUs | |
| Summary of award activity | |
| Granted (in shares) | 1,150,000 |