Quarterly report pursuant to Section 13 or 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
Jun. 30, 2024
Mar. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities $ 3,393,936 $ 3,688,620
Fair value of equity securities 262,860 216,621
Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 3,393,936 3,688,620
Fair value of equity securities 262,860 216,621
Level 1 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 1,848,656 1,909,950
Fair value of equity securities 92,790 75,550
Level 2 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 1,526,631 1,758,228
Fair value of equity securities 170,070 141,071
Level 3 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 18,649 20,442
Fair value of equity securities 0 0
Non-U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 2,135,862 2,409,126
Fair value of equity securities $ 52,413 $ 27,016
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 12.43% 11.61%
Trading securities $ 2,135,862 $ 2,409,126
Total available-for-sale securities, weighted average interest rate 11.73% 10.48%
Fair value of equity securities $ 52,413 $ 27,016
Non-U.S. sovereign debt | Level 1 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 1,455,803 1,592,380
Fair value of equity securities 45,027 12,378
Non-U.S. sovereign debt | Level 2 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 680,059 816,746
Fair value of equity securities 7,386 14,638
Non-U.S. sovereign debt | Level 3 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 0 0
Fair value of equity securities 0 0
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 1,084,410 1,108,870
Fair value of equity securities $ 194,327 $ 173,568
Corporate debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 14.52% 14.83%
Trading securities $ 1,084,410 $ 1,108,870
Total available-for-sale securities, weighted average interest rate 14.96% 15.53%
Fair value of equity securities $ 194,327 $ 173,568
Corporate debt | Level 1 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 242,177 171,218
Fair value of equity securities 31,643 47,135
Corporate debt | Level 2 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 842,016 937,360
Fair value of equity securities 162,684 126,433
Corporate debt | Level 3 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 217 292
Fair value of equity securities 0 0
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities $ 123,520 $ 126,103
Corporate equity | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate
Trading securities $ 123,520 $ 126,103
Corporate equity | Level 1 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 101,371 102,134
Corporate equity | Level 2 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 3,717 3,819
Corporate equity | Level 3 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 18,432 20,150
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 43,452 43,173
Fair value of equity securities $ 16,120 $ 16,037
U.S. sovereign debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 4.19% 4.98%
Trading securities $ 43,452 $ 43,173
Total available-for-sale securities, weighted average interest rate 4.60% 3.54%
Fair value of equity securities $ 16,120 $ 16,037
U.S. sovereign debt | Level 1 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 43,452 43,173
Fair value of equity securities 16,120 16,037
U.S. sovereign debt | Level 2 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 0 0
Fair value of equity securities 0 0
U.S. sovereign debt | Level 3 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 0 0
Fair value of equity securities 0 0
Exchange traded notes    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities $ 6,692 $ 1,348
Exchange traded notes | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate
Trading securities $ 6,692 $ 1,348
Exchange traded notes | Level 1 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 5,853 1,045
Exchange traded notes | Level 2 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 839 303
Exchange traded notes | Level 3 | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities $ 0 $ 0