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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

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