| TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Narrative (Details) $ in Thousands | 9 Months Ended | 12 Months Ended | 
|---|---|---|
| Dec. 31, 2024  USD ($)  issuer | Mar. 31, 2024  USD ($)  issuer | |
| Defined Benefit Plan Disclosure [Line Items] | ||
| Number of issuers | issuer | 2 | 2 | 
| Accumulated impairment loss | $ 456 | $ 413 | 
| Kazakhstan Sustainability Fund JSC | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Percentage of trading securities | 10.00% | 10.00% | 
| Debt securities | $ 544,675 | $ 727,440 | 
| Ministry of Finance of the Republic of Kazakhstan | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Percentage of trading securities | 10.00% | 10.00% | 
| Debt securities | $ 2,609,589 | $ 2,420,855 | 
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- Definition Number of Debt Securities Issuers No definition available. 
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- Definition Percentage of Trading And Available-For-Sale Securities No definition available. 
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Details 
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- Details 
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