Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense Stock-Based Compensation Expense - Unvested Shares (Details)

v2.4.0.8
Stock-Based Compensation Expense Stock-Based Compensation Expense - Unvested Shares (Details) (Stock Options [Member], USD $)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding, beginning of period (in shares) 1,132,780.00 2,179,625 2,757,524
Forfeited (in shares) (7,827) (16,891) (12,056)
Options outstanding, end of period (in shares) 558,466.000 1,132,780.00 2,179,625
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, weighted average exercise price, beginning of period (in dollars per share) $ 6.98 $ 5.74 $ 5.38
Granted, weighted average exercise price (in dollars per share)   $ 21.52 $ 12.00
Forfeited, weighted average exercise price (in dollars per share) $ 15.73 $ 7.98 $ 6.46
Options outstanding, weighted average exercise price, end of period (in dollars per share) $ 7.96 $ 6.98 $ 5.74
Unvested [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options outstanding, beginning of period (in shares) 146,226 117,600 2,757,524
Granted (in shares)   56,532 117,600
Vested (in shares) (33,001) (23,520) (2,757,524)
Forfeited (in shares) (7,827) (4,386)  
Options outstanding, end of period (in shares) 105,398 146,226 117,600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, weighted average exercise price, beginning of period (in dollars per share) $ 8.34 $ 5.99 $ 2.97
Granted, weighted average exercise price (in dollars per share)   $ 12.26 $ 5.99
Vested, weighted average exercise price (in dollars per share) $ 6.92 $ 5.99 $ 2.97
Forfeited, weighted average exercise price (in dollars per share) $ 8.32 $ 8.32  
Options outstanding, weighted average exercise price, end of period (in dollars per share) $ 8.33 $ 8.34 $ 5.99