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Commitments and Contingencies Comitments and Contingencies Text Tag (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Loss Contingency Accrual [1] $ 226 $ 205
Operating Leases, Rent Expense $ 2,400 $ 1,400
[1] (1) Reported in consolidated statements of financial condition as a component of other liabilities