v3.25.1
INVESTMENT SECURITIES - Schedule of present securities assets at fair value, available for sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 2,275,286 $ 3,688,620
Total available-for-sale securities, at fair value 473,587 216,621
Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 1,282,450 2,409,126
Total available-for-sale securities, at fair value 208,231 27,016
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 807,985 1,108,870
Total available-for-sale securities, at fair value 243,730 173,568
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 106,227 126,103
US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 73,787 43,173
Total available-for-sale securities, at fair value 21,626 16,037
Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 4,837 1,348
Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,275,286 3,688,620
Total available-for-sale securities, at fair value $ 473,587 $ 216,621
Fair value, recurring | Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trade securities, weighted average interest rate (in percent) 11.24% 11.61%
Total trading securities $ 1,282,450 $ 2,409,126
Available-for-sale securities, weighted average interest rate (in percent) 9.96% 10.48%
Total available-for-sale securities, at fair value $ 208,231 $ 27,016
Fair value, recurring | Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trade securities, weighted average interest rate (in percent) 13.93% 14.83%
Total trading securities $ 807,985 $ 1,108,870
Available-for-sale securities, weighted average interest rate (in percent) 14.81% 15.53%
Total available-for-sale securities, at fair value $ 243,730 $ 173,568
Fair value, recurring | Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trade securities, weighted average interest rate (in percent) 0.00% 0.00%
Total trading securities $ 106,227 $ 126,103
Fair value, recurring | US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trade securities, weighted average interest rate (in percent) 3.99% 4.98%
Total trading securities $ 73,787 $ 43,173
Available-for-sale securities, weighted average interest rate (in percent) 2.73% 3.54%
Total available-for-sale securities, at fair value $ 21,626 $ 16,037
Fair value, recurring | Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trade securities, weighted average interest rate (in percent) 0.00% 0.00%
Total trading securities $ 4,837 $ 1,348
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 1,444,746 1,909,950
Total available-for-sale securities, at fair value 241,935 75,550
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring | Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 987,657 1,592,380
Total available-for-sale securities, at fair value 128,772 12,378
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring | Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 299,123 171,218
Total available-for-sale securities, at fair value 91,537 47,135
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring | Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 81,810 102,134
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring | US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 73,787 43,173
Total available-for-sale securities, at fair value 21,626 16,037
Quoted Prices in Active Markets for Identical Assets | Fair value, recurring | Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,369 1,045
Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 812,220 1,758,228
Total available-for-sale securities, at fair value 231,652 141,071
Significant Other Observable Inputs | Fair value, recurring | Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 294,793 816,746
Total available-for-sale securities, at fair value 79,459 14,638
Significant Other Observable Inputs | Fair value, recurring | Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 508,862 937,360
Total available-for-sale securities, at fair value 152,193 126,433
Significant Other Observable Inputs | Fair value, recurring | Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 6,097 3,819
Significant Other Observable Inputs | Fair value, recurring | US sovereign debt    
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
Significant Other Observable Inputs | Fair value, recurring | Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 2,468 303
Significant unobservable units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 18,320 20,442
Total available-for-sale securities, at fair value 0 0
Significant unobservable units | Fair value, recurring | Non-US sovereign debt    
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
Significant unobservable units | Fair value, recurring | Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 0 292
Total available-for-sale securities, at fair value 0 0
Significant unobservable units | Fair value, recurring | Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 18,320 20,150
Significant unobservable units | Fair value, recurring | US sovereign debt    
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
Significant unobservable units | Fair value, recurring | Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 0 $ 0