Quarterly report pursuant to Section 13 or 15(d)

TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Narrative (Details)

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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Narrative (Details)
6 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
issuer
Mar. 31, 2023
USD ($)
issuer
Defined Benefit Plan Disclosure [Line Items]    
Number of issuers | issuer 2 2
Other-than-temporary impairment in accumulated other comprehensive loss $ 0 $ 0
Kazakhstan Sustainability Fund JSC    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of trading securities 10.00% 10.00%
Debt securities $ 612,363,000 $ 834,917,000
Ministry of Finance of the Republic of Kazakhstan    
Defined Benefit Plan Disclosure [Line Items]    
Percentage of trading securities 10.00% 10.00%
Debt securities $ 2,310,780,000 $ 1,015,161,000