| 
           STOCK INCENTIVE PLANS AND SHARE-BASED COMPENSATION (Tables)
  
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        12 Months Ended | 
      
      
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           Mar. 31, 2014 
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        | Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | 
         
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        | Schedule of Assumptions Used In Valuing Stock Options | 
        
 
  The weighted-average estimated fair values and the assumptions used in calculating fair values for stock options granted during each fiscal period are as follows:    |   |     |  For the year ended March 31, |     |   |         |  2014 |         |  2013 |         |  2012 |     | Stock option life (in years) |    |  n/a |    |  n/a |     |     |  4.0 |     |     | Risk-free interest rate |     |  n/a |     |  n/a |    |    |  1.57 |  % |     | Stock price volatility |    |  n/a |    |  n/a |     |     |  112.33 |  % |     |  Weighted-average grant date fair value |     |  n/a |     |  n/a |    |  
$      |  1.91 |    |       
   
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        | Schedule of Assumptions Used to Valuing Stock Purchase Plan | 
        
 
  The weighted-average fair values and the assumptions used in calculating fair values during each fiscal period are as follows:    |   |    |  For the year ended March 31, |     |   |    |  2014 |     |  2013 |     |  2012 |     | Option life (in years) |         |     |  0.50 |     |         |     |  0.50 |     |         |     |  0.50 |     |     | Risk-free interest rate |    |    |  0.07 |  % |    |    |  0.13 |  % |    |    |  0.06 |  % |     | Stock price volatility |     |     |  43.71 |  % |     |     |  69.73 |  % |     |     |  70.29 |  % |     |  Weighted-average grant date fair value |    |  
$      |  0.40 |    |    |  
$      |  0.48 |    |    |  
$      |  0.82 |    |       
   
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        | Schedule of Share-based Compensation Expense | 
        
     |   |    |  For the year ended March 31, |     |   |     |  2014 |     |  2013 |     |  2012 |     | Share-based compensation expense: |         |     |     |         |     |     |         |     |     |     |         Cost of revenue |    |  $ |  1,963 |    |  $ |  2,389 |    |  $ |  2,203 |     |         Research and development |     |     |  3,430 |     |     |  3,665 |     |     |  3,250 |     |         Sales and marketing |    |    |  4,097 |    |    |  4,699 |    |    |  4,048 |     |         General and administrative |     |    |   3,969 |     |    |   4,386 |     |    |   4,236 |     | Total share-based compensation expense |    |  
$      |  13,459 |    |  
$      |  15,139 |    |  
$      |  13,737 |     |   |    
     
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        | Schedule of Share-based Compensation by Type of Award | 
        
 
   |   |    |  For the year ended March 31, |     |   |     |  2014 |     |  2013 |     |  2012 |     | Share-based compensation by type of award: |     |     |     |     |     |     |     |     |     |     |         Stock options |    |  $ |  826 |    |  $ |  1,681 |    |  $ |  2,622 |     |         Restricted stock |     |     |  11,356 |     |     |  11,630 |     |     |  9,053 |     |         Stock purchase plan |    |    |  1,277 |    |    |  1,828 |    |    |  2,062 |     | Total share-based compensation expense |     |  $ |   13,459 |     |  $ |   15,139 |     |  $ |   13,737 |       
   
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        | Schedule of Stock Option Activity | 
        
 
  A summary of activity relating to all of our stock option plans is as follows (stock options and intrinsic value in thousands):    |   |     |  Stock Options |    |  Weighted-  Average  Exercise Price |     |  Weighted-  Average  Remaining  Contractual Term |     |  Aggregate  Intrinsic Value |     | Outstanding as of March 31, 2011 |     |  22,080 |     |     |  $ |  2.43 |     |     |     |     |     |     |         Granted and assumed |    |  1,619 |    |    |    |  2.33 |    |    |    |    |    |     |         Exercised |     |  (2,982 |  ) |     |     |  1.79 |     |     |     |     |     |     |         Forfeited |    |  (619 |  ) |    |    |  1.90 |    |    |    |    |    |     |         Expired |     |   (704 |  ) |     |     |  8.25 |     |     |     |     |     |     | Outstanding as of March 31, 2012 |    |  19,394 |    |    |    |  2.32 |    |    |    |    |    |     |         Exercised |     |  (379 |  ) |     |     |  0.96 |     |     |     |     |     |     |         Forfeited |    |  (406 |  ) |    |    |  2.43 |    |    |    |    |    |     |         Expired |     |   (2,559 |  ) |     |     |  3.65 |     |     |     |     |     |     | Outstanding as of March 31, 2013 |    |  16,050 |    |    |    |  2.14 |    |    |    |    |    |     |         Exercised |     |  (989 |  ) |     |     |  0.98 |     |     |     |     |     |     |         Forfeited |    |  (3,199 |  ) |    |    |  3.44 |    |    |    |    |    |     |         Expired |     |           (3,865 |  ) |     |     |  2.11 |     |     |     |     |     |     | Outstanding as of March 31, 2014 |    |  7,997 |    |    |  $ |  1.78 |    |  2.04 |    |  
$            |  1,007 |     | Vested and expected to vest at March 31, 2014 |     |   7,980 |    |     |  $ |  1.77 |     |  2.03 |     |  $ |  1,007 |     | Exercisable as of March 31, 2014 |         |  7,641 |    |         |  
$        |  1.74 |         |  1.95 |         |  $ |  1,006 |       
   
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        | Schedule of Options Outstanding and Exercisable, by Exercise Price Range | 
        
 
 The following table summarizes information about stock options outstanding and exercisable as of March 31, 2014 (stock options in thousands):    | Range of Exercise Prices |     |     |  Stock Options  Outstanding |     |  Weighted-  Average  Exercise  Price |     |  Weighted-  Average  Remaining  Contractual Life  (Years) |     |  Stock Options  Exercisable |     |  Weighted-  Average  Exercise  Price |     | $ |  0.11 |  - |  
$    |  0.63 |         |     |  159 |     |  
$         |  0.56 |     |  5.14 |     |  157 |         |  
$      |  0.56 |     | $ |  0.77 |  - |  $ |  0.98 |    |    |  3,615 |         |    |  0.98 |         |  2.18 |         |  3,615 |    |    |  0.98 |     | $ |  1.00 |  - |  $ |  1.39 |     |     |  589 |     |     |  1.21 |     |  1.69 |     |  589 |     |     |  1.21 |     | $ |  1.52 |  - |  $ |  2.17 |    |    |  579 |    |    |  1.63 |    |  0.75 |    |  579 |    |    |  1.63 |     | $ |  2.30 |  - |  $ |  3.40 |     |     |  2,830 |     |     |  2.83 |     |  2.14 |     |  2,476 |     |     |  2.88 |     | 
$    |  4.00 |  - |  $ |  4.00 |    |    |  225 |    |    |  4.00 |    |  0.59 |    |  225 |    |    |  4.00 |     |    |     |     |     |     |     |     |   7,997 |     |  $ |  1.78 |     |  2.04 |     |   7,641 |     |  $ |  1.74 |       
   
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        | Schedule of Restricted Stock Activity | 
        
 
  A summary of activity relating to our restricted stock follows (shares in thousands):    |   |     |  Shares |     |  Weighted-Average  Grant Date  Fair Value |     | Nonvested at March 31, 2011 |         |  6,640 |     |         |  $ |  1.95 |     |         Granted and assumed |    |  6,669 |    |    |    |  3.14 |     |         Vested |     |         (3,058 |  ) |     |     |  1.88 |     |         Forfeited |    |  (1,390 |  ) |    |    |  2.73 |     | Nonvested at March 31, 2012 |     |  8,861 |     |     |     |  2.75 |     |         Granted |    |  5,514 |    |    |    |  1.98 |     |         Vested |     |  (3,566 |  ) |     |     |  2.55 |     |         Forfeited |    |  (922 |  ) |    |    |  2.30 |     | Nonvested at March 31, 2013 |     |  9,887 |     |     |     |  2.43 |     |         Granted |    |  8,280 |    |    |    |  1.39 |     |         Vested |     |  (4,486 |  ) |     |     |  2.39 |     |         Forfeited |    |  (1,573 |  ) |    |    |  1.93 |     | Nonvested at March 31, 2014 |     |   12,108 |    |     |  
$                   |  1.80 |       
   
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           Pancetera [Member] 
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        | Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | 
         
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        | Schedule of Assumptions Used In Valuing Stock Options | 
        
 
  The weighted-average fair value of stock options assumed from Pancetera, as well as the weighted-average assumptions used in calculating these values were based on estimates at the acquisition date as follows:    | Option life (in years) |     |     |  5.2 |     |     | Risk-free interest rate |    |    |  1.65 |  % |     | Stock price volatility |     |     |  100.93 |  % |     |  Weighted-average fair value |         |  
$      |  2.67 |    |       
   
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