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Benefit Plans- Stock Grant Fair Value Assumptions (Details) - USD ($)
9 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation   $ 0    
Compensation related to stock option and restricted stock plans   $ (17,635,309) $ (5,434,619) $ (4,810,698)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 107.52 $ 51.15
Dividend yield   0.00% 0.00% 0.00%
Expected volatility   48.94% 52.97% 48.90%
Average risk-free interest rate   3.01% 1.98% 1.20%
Expected life   6 years 8 months 11 days 5 years 5 years 3 days
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation related to stock option and restricted stock plans   $ (13,643,343) $ (3,081,405) $ (1,604,257)
Restricted Stock [Abstract]     24,456 74,490
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 101.61    
Target 3 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award $25.30      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Target, Vesting Percentage 100.00%      
Target 1 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award $16.35      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Target, Vesting Percentage   40.00%    
Target 2 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award $20.45      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Target, Vesting Percentage   60.00%