STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION - STOCK-BASED COMPENSATION - BY LINE ITEM (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | $ 16,459 | $ 17,683 |
| Cost of revenue - product | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | 117 | 341 |
| Cost of revenue - service and support | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | 729 | 1,252 |
| Research and development, net | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | 1,509 | 3,031 |
| Selling, general and administrative | ||
| Stock-Based Compensation Plans | ||
| Stock-based compensation expense | $ 14,104 | $ 13,059 |