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Customer Liabilities (Tables)
9 Months Ended
Dec. 31, 2019
Contract with Customer, Liability [Abstract]  
Customer liabilities
    December 31, 2019      March 31, 2019  
             
Brokerage customers   $ 126,974     $ 47,686  
Banking customers     65,780       34,346  
Total   $ 192,754     $ 82,032