Annual report pursuant to Section 13 and 15(d)

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

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Stock-Based Compensation Expense Stock-Based Compensation Expense - Unvested Shares (Details) (Stock Options [Member], USD $)
 1 Months Ended 11 Months Ended 12 Months Ended
Apr. 30, 2010
Mar. 31, 2011
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) 0 0 2,179,625 2,757,524
Forfeited (in shares) 0 0 (16,891) (12,056)
Options outstanding, end of period (in shares) 0 2,757,524 1,132,780 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) $ 0.00 $ 0.00 $ 5.74 $ 5.38
Granted, weighted average exercise price (in dollars per share) $ 0.00 $ 5.38 $ 21.52 $ 12.00
Forfeited, weighted average exercise price (in dollars per share) $ 0.00 $ 0.00 $ 7.98 $ 6.46
Options outstanding, weighted average exercise price, end of period (in dollars per share) $ 0.00 $ 5.38 $ 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) 0 0 117,600 2,757,524
Granted (in shares) 0 2,757,524 56,532 117,600
Vested (in shares) 0   (23,520) (2,757,524)
Forfeited (in shares) 0 0 (4,386) 0
Options outstanding, end of period (in shares) 0 2,757,524 146,226 117,600
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) $ 0.00 $ 0.00 $ 5.99 $ 2.97
Granted, weighted average exercise price (in dollars per share) $ 0.00 $ 2.97 $ 12.26 $ 5.99
Vested, weighted average exercise price (in dollars per share) $ 0.00   $ 5.99 $ 2.97
Forfeited, weighted average exercise price (in dollars per share) $ 0.00 $ 0.00 $ 8.32 $ 0.00
Options outstanding, weighted average exercise price, end of period (in dollars per share) $ 0.00 $ 2.97 $ 8.34 $ 5.99