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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of trading and available-for-sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities | $ 3,603,884 | $ 2,412,556
Fair value of equity securities | 192,546 | 239,053
Non-U.S. sovereign debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities | 2,323,178 | 1,029,857
Fair value of equity securities | 47,363 | 40,162
Corporate debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities | 1,135,870 | 1,269,879
Fair value of equity securities | 133,093 | 191,082
Corporate equity |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities | 97,718 | 65,741
U.S. sovereign debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities | 44,778 | 45,022
Fair value of equity securities | 12,090 | 7,809
Exchange traded notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities | $ 2,340 | $ 2,057

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