STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION - BY TYPE (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
|
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | $ 15,340 | $ 14,850 |
| Equity Settled Awards | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | 15,312 | 14,791 |
| Equity Settled Awards | Restricted stock units and restricted stock awards | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | 13,966 | 13,100 |
| Equity Settled Awards | Stock Bonus Program and Bonus Share Program | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | 1,346 | 1,691 |
| Liability Settled Awards | Phantom stock units (cash settled awards) | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | $ 28 | $ 59 |