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CUSTOMER LIABILITIES - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Revenue, Major Customer [Line Items] |  |
Customer liabilities | $ 5,759,636 | $ 4,304,999
Nonrelated Party |  |
Revenue, Major Customer [Line Items] |  |
Customer liabilities | $ 2,114,962 | $ 731,363
Kazakhstan Sustainability Fund JSC |  |
Revenue, Major Customer [Line Items] |  |
Percentage of trading securities | 10.00% | 10.00%
JSC Kazakhstan Deposit Insurance Fund |  |
Revenue, Major Customer [Line Items] |  |
Insured bank deposits, price per client | $ 36 |
Insured bank deposits | $ 737,127 | $ 669,753

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