STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - BONUS SHARE PROGRAM (Details) - USD ($) $ in Millions |
Apr. 30, 2018 |
Jan. 31, 2018 |
|---|---|---|
| Combined Stock Bonus Program and Bonus Share Program | ||
| Stock-Based Compensation Plans | ||
| Total accrued liability | $ 10.7 | $ 9.2 |
| 2018 Plan | Bonus Share Program | ||
| Stock-Based Compensation Plans | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 300,000 | |
| 2019 Plan | Bonus Share Program | ||
| Stock-Based Compensation Plans | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 300,000 |