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INVESTMENT SECURITIES - Schedule of present securities assets at fair value (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | $ 2,001,392 | $ 2,275,286
Total available-for-sale securities, at fair value | 492,138 | 473,587
Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 2,001,392 | 2,275,286
Total available-for-sale securities, at fair value | 492,138 | 473,587
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 1,109,878 | 1,444,746
Total available-for-sale securities, at fair value | 217,349 | 241,935
Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 870,942 | 812,220
Total available-for-sale securities, at fair value | 274,789 | 231,652
Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 20,572 | 18,320
Total available-for-sale securities, at fair value | 0 | 0
Non-U.S. sovereign debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 1,042,485 | 1,282,450
Total available-for-sale securities, at fair value | $ 230,572 | $ 208,231
Non-U.S. sovereign debt | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities, weighted average interest rate | 11.06% | 11.24%
Total trading securities | $ 1,042,485 | $ 1,282,450
Total available-for-sale securities, weighted average interest rate | 11.53% | 9.96%
Total available-for-sale securities, at fair value | $ 230,572 | $ 208,231
Non-U.S. sovereign debt | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 632,872 | 987,657
Total available-for-sale securities, at fair value | 126,118 | 128,772
Non-U.S. sovereign debt | Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 409,613 | 294,793
Total available-for-sale securities, at fair value | 104,454 | 79,459
Non-U.S. sovereign debt | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 0 | 0
Total available-for-sale securities, at fair value | 0 | 0
Corporate debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 751,558 | 807,985
Total available-for-sale securities, at fair value | $ 239,720 | $ 243,730
Corporate debt | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities, weighted average interest rate | 12.90% | 13.93%
Total trading securities | $ 751,558 | $ 807,985
Total available-for-sale securities, weighted average interest rate | 15.68% | 14.81%
Total available-for-sale securities, at fair value | $ 239,720 | $ 243,730
Corporate debt | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 294,247 | 299,123
Total available-for-sale securities, at fair value | 69,385 | 91,537
Corporate debt | Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 456,270 | 508,862
Total available-for-sale securities, at fair value | 170,335 | 152,193
Corporate debt | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 1,041 | 0
Total available-for-sale securities, at fair value | 0 | 0
Corporate equity |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | $ 128,316 | $ 106,227
Corporate equity | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities, weighted average interest rate | 0.00% | 0.00%
Total trading securities | $ 128,316 | $ 106,227
Corporate equity | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 106,238 | 81,810
Corporate equity | Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 2,547 | 6,097
Corporate equity | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 19,531 | 18,320
U.S. sovereign debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 74,369 | 73,787
Total available-for-sale securities, at fair value | $ 21,846 | $ 21,626
U.S. sovereign debt | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities, weighted average interest rate | 3.88% | 3.99%
Total trading securities | $ 74,369 | $ 73,787
Total available-for-sale securities, weighted average interest rate | 3.99% | 2.73%
Total available-for-sale securities, at fair value | $ 21,846 | $ 21,626
U.S. sovereign debt | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 74,369 | 73,787
Total available-for-sale securities, at fair value | 21,846 | 21,626
U.S. sovereign debt | Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 0 | 0
Total available-for-sale securities, at fair value | 0 | 0
U.S. sovereign debt | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 0 | 0
Total available-for-sale securities, at fair value | 0 | 0
Exchange traded notes and funds |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | $ 4,664 | $ 4,837
Exchange traded notes and funds | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Trading securities, weighted average interest rate | 0.00% | 0.00%
Total trading securities | $ 4,664 | $ 4,837
Exchange traded notes and funds | Quoted Prices in Active Markets for Identical Assets | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 2,152 | 2,369
Exchange traded notes and funds | Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 2,512 | 2,468
Exchange traded notes and funds | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | $ 0 | $ 0

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