| 
           STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION (Schedule of Share-based Compensation) (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        3 Months Ended | |
|---|---|---|
| 
           Jun. 30, 2014 
         | 
        
           Jun. 30, 2013 
         | 
      |
| Share-based compensation: | ||
| Share-based compensation | $ 3,068 | $ 3,356 | 
| 
           Cost of revenue [Member] 
         | 
        ||
| Share-based compensation: | ||
| Share-based compensation | 414 | 528 | 
| 
           Research and development [Member] 
         | 
        ||
| Share-based compensation: | ||
| Share-based compensation | 780 | 868 | 
| 
           Sales and marketing [Member] 
         | 
        ||
| Share-based compensation: | ||
| Share-based compensation | 910 | 1,074 | 
| 
           General and administrative [Member] 
         | 
        ||
| Share-based compensation: | ||
| Share-based compensation | $ 964 | $ 886 |