Quarterly report pursuant to Section 13 or 15(d)

TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details)

v3.22.2.2
TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of valuation techniques and significant level 3 inputs used in the valuation (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities $ 1,359,544 $ 1,158,377
Fair value of equity securities 168,175 161,364
Fair value 4,175 9,142
Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 1,359,544 1,158,377
Fair value of equity securities 168,175 161,364
Fair value, recurring | Level 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 1,087,682 1,148,959
Fair value of equity securities 158,753 160,917
Fair value, recurring | Level 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 267,687 276
Fair value of equity securities 9,421 0
Fair value, recurring | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 4,175 9,142
Fair value of equity securities 1 447
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 666,137 712,133
Fair value of equity securities 155,529 145,836
Fair value $ 515 $ 595
Fair value input 74.00% 45.00%
Estimated number of years 3 months 3 months
Corporate debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 10.90% 9.09%
Trading securities $ 666,137 $ 712,133
Total available-for-sale securities, weighted average interest rate 12.20% 11.09%
Fair value of equity securities $ 155,529 $ 145,836
Corporate debt | Fair value, recurring | Level 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 622,933 711,538
Fair value of equity securities 147,582 145,836
Corporate debt | Fair value, recurring | Level 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 42,689 0
Fair value of equity securities 7,947 0
Corporate debt | Fair value, recurring | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 515 595
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 634,056 360,570
Fair value of equity securities 8,293 12,997
Fair value $ 3,337 $ 7,524
Fair value input 48.80% 69.00%
Estimated number of years 11 years 11 years
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 10.90% 13.15%
Trading securities $ 634,056 $ 360,571
Total available-for-sale securities, weighted average interest rate 5.90% 5.51%
Fair value of equity securities $ 8,293 $ 12,997
Non-U.S. sovereign debt | Fair value, recurring | Level 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 421,301 352,275
Fair value of equity securities 7,661 12,551
Non-U.S. sovereign debt | Fair value, recurring | Level 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 209,418 0
Fair value of equity securities 632 0
Non-U.S. sovereign debt | Fair value, recurring | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 3,337 8,296
Fair value of equity securities 0 446
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 32,522 72,354
Fair value of equity securities 1 1
Fair value $ 323 $ 251
Fair value input 58.80% 20.00%
Estimated number of years 9 years 9 years
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%
Trading securities $ 32,522 $ 72,354
Total available-for-sale securities, weighted average interest rate 0.00% 0.00%
Fair value of equity securities $ 1 $ 1
Corporate equity | Fair value, recurring | Level 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 19,986 71,827
Fair value of equity securities 0 0
Corporate equity | Fair value, recurring | Level 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 12,213 276
Fair value of equity securities 0 0
Corporate equity | Fair value, recurring | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 323 251
Fair value of equity securities 1 1
US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 23,883 10,435
Fair value of equity securities $ 4,352 $ 2,530
US sovereign debt | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 4.32% 2.35%
Trading securities $ 23,883 $ 10,435
Total available-for-sale securities, weighted average interest rate 4.05% 2.17%
Fair value of equity securities $ 4,352 $ 2,530
US sovereign debt | Fair value, recurring | Level 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 20,997 10,435
Fair value of equity securities 3,510 2,530
US sovereign debt | Fair value, recurring | Level 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 2,886 0
Fair value of equity securities 842 0
US sovereign debt | Fair value, recurring | Level 3    
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 $ 2,946 $ 2,884
Exchange traded notes | Fair value, recurring    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities, weighted average interest rate 0.00% 0.00%
Trading securities $ 2,946 $ 2,884
Exchange traded notes | Fair value, recurring | Level 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 2,465 2,884
Exchange traded notes | Fair value, recurring | Level 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities 481 0
Exchange traded notes | Fair value, recurring | Level 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Trading securities $ 0 0
Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value   $ 772
Fair value input   13.90%
Estimated number of years   1 year