Annual report pursuant to Section 13 and 15(d)

TRADING AND AVAILABLE-FOR-SALE SECURITIES AT FAIR VALUE - Schedule of present securities assets at fair value (Details)

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TRADING AND AVAILABLE-FOR-SALE SECURITIES AT FAIR VALUE - Schedule of present securities assets at fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 3,688,620 $ 2,412,556
Total available-for-sale securities, at fair value 216,621 239,053
Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 3,688,620 2,412,556
Total available-for-sale securities, at fair value 216,621 239,053
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 1,909,950 2,186,786
Total available-for-sale securities, at fair value 75,550 176,937
Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 1,758,228 220,632
Total available-for-sale securities, at fair value 141,071 62,116
Significant unobservable units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 20,442 5,138
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 2,409,126 1,029,857
Total available-for-sale securities, at fair value $ 27,016 $ 40,162
Non-U.S. sovereign debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average interest rate (in percent) 11.61% 12.04%
Total trading securities $ 2,409,126 $ 1,029,857
Total available-for-sale securities, Weighted average interest rate (in percent) 10.48% 13.64%
Total available-for-sale securities, at fair value $ 27,016 $ 40,162
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 1,592,380 971,762
Total available-for-sale securities, at fair value 12,378 39,624
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 816,746 54,319
Total available-for-sale securities, at fair value 14,638 538
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 3,776
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 1,108,870 1,269,879
Total available-for-sale securities, at fair value $ 173,568 $ 191,082
Corporate debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average interest rate (in percent) 14.83% 15.62%
Total trading securities $ 1,108,870 $ 1,269,879
Total available-for-sale securities, Weighted average interest rate (in percent) 15.53% 15.78%
Total available-for-sale securities, at fair value $ 173,568 $ 191,082
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 171,218 1,106,584
Total available-for-sale securities, at fair value 47,135 129,504
Corporate debt | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 937,360 162,895
Total available-for-sale securities, at fair value 126,433 61,578
Corporate debt | Significant unobservable units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 292 400
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 $ 126,103 $ 65,741
Corporate equity | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average interest rate (in percent) 0.00%
Total trading securities $ 126,103 $ 65,741
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 102,134 62,971
Corporate equity | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 3,819 1,808
Corporate equity | Significant unobservable units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 20,150 962
US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 43,173 45,022
Total available-for-sale securities, at fair value $ 16,037 $ 7,809
US sovereign debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average interest rate (in percent) 4.98% 4.22%
Total trading securities $ 43,173 $ 45,022
Total available-for-sale securities, Weighted average interest rate (in percent) 3.54% 4.24%
Total available-for-sale securities, at fair value $ 16,037 $ 7,809
US 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 43,173 45,022
Total available-for-sale securities, at fair value 16,037 7,809
US 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
US 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    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 1,348 $ 2,057
Exchange traded notes | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average interest rate (in percent) 0.00%
Total trading securities $ 1,348 $ 2,057
Exchange traded notes | 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 1,045 447
Exchange traded notes | Significant Other Observable Inputs | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities 303 1,610
Exchange traded notes | Significant unobservable units | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total trading securities $ 0 $ 0