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Benefit Plans- Stock Grant Fair Value Assumptions (Details) - USD ($)
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation $ (565,162)        
Compensation related to stock option and restricted stock plans $ (4,810,698) $ 6,356,767 $ (15,968,637)    
Dividend yield 0.00% 0.00% 0.00%    
Expected volatility 48.90% 41.41% 44.62%    
Average risk-free interest rate 1.20% 1.38% 1.77%    
Expected life 5 years 3 days 5 years 9 days 6 years 1 month 6 days    
Group A Performance Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted Stock [Abstract]       8,590 70,800
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation related to stock option and restricted stock plans $ (1,604,257)   $ (8,138,643)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 51.15        
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation related to stock option and restricted stock plans $ 9,700,000        
Group B Performance Award [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation related to stock option and restricted stock plans 2,900,000        
Restricted Stock [Abstract]       56,660 443,700
Share-based Compensation Award, Tranche One [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation related to stock option and restricted stock plans (0.25)        
Maximum [Member] | EPS Target [Member] | Below $9.26 EPS [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
EPS Target (in dollars per share) $ 9.26