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
 9 Months Ended 12 Months Ended
Dec. 31, 2024
Mar. 31, 2024
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 2,228,788 $ 1,052,758
Customer liabilities 3,783,291 2,273,830
Term deposits    
Revenue, Major Customer [Line Items]    
Term deposits $ 1,554,503 $ 1,221,072
Term deposits | Minimum    
Revenue, Major Customer [Line Items]    
Debt securities, interest rate during period (in percent) 0.05% 0.04%
Term deposits | Maximum    
Revenue, Major Customer [Line Items]    
Debt securities, interest rate during period (in percent) 18.10% 17.30%
Brokerage customers    
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 1,804,039 $ 742,902
Current customer accounts    
Revenue, Major Customer [Line Items]    
Total non-interest-bearing accounts $ 424,749 $ 309,856