Quarterly report pursuant to Section 13 or 15(d)

CUSTOMER LIABILITIES - Schedule of customer liabilities (Details)

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CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Mar. 31, 2023
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts $ 1,376,573   $ 1,092,496
Total customer liabilities 2,439,187   1,925,247
Term deposits      
Revenue, Major Customer [Line Items]      
Term deposits $ 1,062,614   832,751
Term deposits | Minimum      
Revenue, Major Customer [Line Items]      
Debt securities, interest rate during period (in percent) 0.10% 0.10%  
Term deposits | Maximum      
Revenue, Major Customer [Line Items]      
Debt securities, interest rate during period (in percent) 16.90% 16.90%  
Current customer accounts      
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts $ 430,129   458,954
Brokerage customers      
Revenue, Major Customer [Line Items]      
Total non-interest-bearing accounts $ 946,444   $ 633,542