Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Expense - Restricted Shares (Details)

v2.4.0.6
Stock-Based Compensation Expense - Restricted Shares (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2011
Restricted Stock [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value $ 468,187,000    
Total unrecognized expense related to non-vested stock option awards 130,363,000    
Restricted Stock Units (RSUs) [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value 1,579,331,000    
Total unrecognized expense related to non-vested stock option awards $ 1,203,831,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Stock based compensation, recognition period 1 year 4 months 28 days    
Predecessor [Member] | Restricted Stock [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of period (in shares) 16,136,000   0
Granted (in shares) 13,012,000 16,136,000  
Exercised (in shares) (8,068,000) 0  
Forfeited (in shares) 0 0  
Outstanding, end of period (in shares) 21,080,000 16,136,000 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, weighted average grant price, beginning of period (in dollars per share) $ 12.42   $ 0.00
Granted, weighted average exercise price (in dollars per share) $ 21.52 $ 12.42  
Exercised, weighted average exercise price (in dollars per share) $ 12.42 $ 0.00  
Forfeited, weighted average exercise price (in dollars per share) $ 0.00 $ 0.00  
Options outstanding, weighted average grant price, end of period (in dollars per share) $ 18.09 $ 12.42 $ 0.00
Predecessor [Member] | Restricted Stock Units (RSUs) [Member]
      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of period (in shares) 0   0
Granted (in shares) 71,923,000 0  
Exercised (in shares) 0 0  
Forfeited (in shares) (814,000) 0  
Outstanding, end of period (in shares) 71,109,000 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Options outstanding, weighted average grant price, beginning of period (in dollars per share) $ 0.00   $ 0.00
Granted, weighted average exercise price (in dollars per share) $ 21,520.00 $ 0.00  
Exercised, weighted average exercise price (in dollars per share) $ 0.00 $ 0.00  
Forfeited, weighted average exercise price (in dollars per share) $ 0.00 $ 0.00  
Options outstanding, weighted average grant price, end of period (in dollars per share) $ 21,520.00 $ 0.00 $ 0.00