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CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 31, 2021
Revenue, Major Customer [Line Items]    
Customer liabilities $ 1,417,937 $ 1,163,697
Brokerage customers    
Revenue, Major Customer [Line Items]    
Customer liabilities 1,078,204 938,086
Banking customers    
Revenue, Major Customer [Line Items]    
Customer liabilities $ 339,733 $ 225,611