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CUSTOMER LIABILITIES - Schedule of customer liabilities (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Revenue, Major Customer [Line Items] |  |
Total non-interest-bearing accounts | $ 3,929,916 | $ 2,582,686
Customer liabilities | 5,759,636 | 4,304,999
Term deposits |  |
Revenue, Major Customer [Line Items] |  |
Term deposits | $ 1,829,720 | $ 1,722,313
Term deposits | Minimum |  |
Revenue, Major Customer [Line Items] |  |
Debt securities, interest rate during period (in percent) | 0.04% | 0.05%
Term deposits | Maximum |  |
Revenue, Major Customer [Line Items] |  |
Debt securities, interest rate during period (in percent) | 18.45% | 18.30%
Brokerage customers |  |
Revenue, Major Customer [Line Items] |  |
Total non-interest-bearing accounts | $ 3,407,509 | $ 2,167,111
Customer accounts |  |
Revenue, Major Customer [Line Items] |  |
Total non-interest-bearing accounts | $ 522,407 | $ 415,575

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