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Stockholders' Equity (Narrative) (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2013
Stock Options [Member]
Mar. 31, 2012
Stock Options [Member]
Mar. 31, 2011
Stock Options [Member]
Mar. 31, 2013
Restricted Stock And Stock Awards [Member]
Mar. 31, 2012
Restricted Stock And Stock Awards [Member]
Mar. 31, 2011
Restricted Stock And Stock Awards [Member]
Mar. 31, 2013
Performance-Based Restricted Stock [Member
Mar. 31, 2012
Performance-Based Restricted Stock [Member
May 31, 2011
Restricted Stock Units (RSUs) [Member]
Mar. 31, 2013
2007 Stock Incentive Plan [Member]
Mar. 31, 2013
2007 Director Stock Option Plan [Member]
Mar. 31, 2013
Employee Stock Purchase Plan [Member]
Mar. 31, 2012
Employee Stock Purchase Plan [Member]
Mar. 31, 2011
Employee Stock Purchase Plan [Member]
Mar. 31, 2013
Maximum [Member]
Stock Options [Member]
Mar. 31, 2013
Maximum [Member]
Restricted Stock And Stock Awards [Member]
Mar. 31, 2013
Maximum [Member]
U.S. Treasury Rates [Member]
Mar. 31, 2013
Minimum [Member]
Stock Options [Member]
Mar. 31, 2013
Minimum [Member]
Restricted Stock And Stock Awards [Member]
Mar. 31, 2013
Minimum [Member]
U.S. Treasury Rates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                              
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures       $ 3,500,000 $ 6,100,000   $ 5,800,000 $ 5,000,000                              
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)       1 year 8 months 12 days     1 year 3 months 18 days                                
Weighted-average grant-date fair value of stock option awards granted $ 2.56 $ 6.02 $ 17.43                                        
Aggregate intrinsic value of exercisable options 0   8,700,000                                        
Aggregate intrinsic value of options exercised     13,000,000                                        
Stock-based compensation plans expired terms                                       7 years     5 years
Total fair value of restricted stock granted             10,600,000 5,600,000 10,400,000                            
Total fair value of restricted stock granted for bonuses and severance             1,600,000                                
Total fair value of restricted stock vested             3,400,000 4,100,000 5,500,000                            
Total fair value of restricted stock granted for bonuses and severance             1,600,000                                
Restricted stock granted 3,126,749                 1,422,127 109,211                        
Stock-based compensation expense 8,138,000 9,864,000 13,412,000 3,389,000 6,177,000 6,374,000 4,698,000 3,633,000 6,919,000 1,800,000         51,000 54,000 119,000            
Number of shares cancelled 646,493                     37,375                      
Stock-based compensation plans expired terms May 02, 2007                                            
Number of shares awarded annually                           3,000                  
Contractual life of options, in years 10 years                                            
Vesting period, in years                                   5 years 5 years   3 years 2 years  
Number of shares granted by option upon election to the board                           10,000                  
Number of shares authorized for issuance under the plan                         5,389,465 177,000 339,269                
Percentage of purchase discount                             15.00%                
Compensation expense recognized $ 100,000 $ 100,000 $ 100,000                                        
Common stock shares issued                             99,935