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INVESTMENT SECURITIES - Schedule of present securities assets at fair value (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | $ 1,740,526 | $ 2,275,286
Total available-for-sale securities, at fair value | 439,801 | 473,587
Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 1,740,526 | 2,275,286
Total available-for-sale securities, at fair value | 439,801 | 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 | 956,082 | 1,444,746
Total available-for-sale securities, at fair value | 195,678 | 241,935
Significant Other Observable Inputs | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 761,990 | 812,220
Total available-for-sale securities, at fair value | 244,123 | 231,652
Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 22,454 | 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 | 977,357 | 1,282,450
Total available-for-sale securities, at fair value | $ 220,214 | $ 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 | 11.59% | 11.24%
Total trading securities | $ 977,357 | $ 1,282,450
Total available-for-sale securities, weighted average interest rate | 11.47% | 9.96%
Total available-for-sale securities, at fair value | $ 220,214 | $ 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 | 492,282 | 987,657
Total available-for-sale securities, at fair value | 78,235 | 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 | 485,075 | 294,793
Total available-for-sale securities, at fair value | 141,979 | 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 | 532,203 | 807,985
Total available-for-sale securities, at fair value | $ 197,676 | $ 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 | $ 532,203 | $ 807,985
Total available-for-sale securities, weighted average interest rate | 16.11% | 14.81%
Total available-for-sale securities, at fair value | $ 197,676 | $ 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 | 257,185 | 299,123
Total available-for-sale securities, at fair value | 95,532 | 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 | 273,945 | 508,862
Total available-for-sale securities, at fair value | 102,144 | 152,193
Corporate debt | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 1,073 | 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 | $ 148,271 | $ 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 | $ 148,271 | $ 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 | 125,700 | 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 | 1,190 | 6,097
Corporate equity | Significant Unobservable Units | Fair value, recurring |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 21,381 | 18,320
U.S. sovereign debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total trading securities | 76,343 | 73,787
Total available-for-sale securities, at fair value | $ 21,911 | $ 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 | 3.72% | 3.99%
Total trading securities | $ 76,343 | $ 73,787
Total available-for-sale securities, weighted average interest rate | 2.40% | 2.73%
Total available-for-sale securities, at fair value | $ 21,911 | $ 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 | 76,343 | 73,787
Total available-for-sale securities, at fair value | 21,911 | 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 | $ 6,352 | $ 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 | $ 6,352 | $ 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 | 4,572 | 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 | 1,780 | 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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