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Related Party Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2015
Related Party Transaction [Line Items]        
Related party debt outstanding $ 0 $ 597,150    
Subordinated Debt | Subordinated Demand Promissory Notes | Affiliated Entity        
Related Party Transaction [Line Items]        
Debt instrument, face amount       $ 1,800,000
Related party debt outstanding   478,500    
Accrued interest   $ 118,700    
Interest rate   2.72%    
Interest expense $ 4,100 $ 27,400 $ 35,200