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Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Restricted cash $ 51,177 $ 38,460
Brokerage customers' cash    
Restricted cash 47,083 28,931
Guaranty deposits    
Restricted cash 3,601 732
Reserve with Central Bank of Russia    
Restricted cash 493 263
Deferred distribution payments    
Restricted cash $ 0 $ 8,534