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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Related Party Transaction [Line Items]      
Contribution for taxes associated with reorganization $ 265,000    
Cash payments to related parties 0 $ 1,177,021 $ 74,616
Affiliated Entity | Financial And Management Advisory Services      
Related Party Transaction [Line Items]      
Transfers to related parties (1,600) (4,900) (4,900)
Affiliated Entity | Debt Service And Shared Costs      
Related Party Transaction [Line Items]      
Cash payments to related parties   1,177,000 74,600
Affiliated Entity | Other Related Party Settlements      
Related Party Transaction [Line Items]      
Transfers to related parties   14,300 35,200
Additional Paid-In Capital      
Related Party Transaction [Line Items]      
Contribution for taxes associated with reorganization $ 265,000    
Additional Paid-In Capital | Affiliated Entity | Transfers To Related Parties      
Related Party Transaction [Line Items]      
Transfers to related parties   $ 800 $ 3,900