Quarterly report pursuant to Section 13 or 15(d)

SECURITIES REPURCHASE AGREEMENT OBLIGATIONS - Schedule of trading securities including collateralized securities subject to repurchase agreements (Details)

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SECURITIES REPURCHASE AGREEMENT OBLIGATIONS - Schedule of trading securities including collateralized securities subject to repurchase agreements (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2023
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations $ 2,889,173 $ 1,517,416
Up to 30 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations 2,640,642 1,456,776
30-90 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations $ 248,531 $ 60,640
Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 15.59% 15.98%
Securities repurchase agreement obligations $ 1,924,268 $ 881,461
Non-US sovereign debt | Up to 30 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations 1,746,953 826,196
Non-US sovereign debt | 30-90 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations $ 177,315 $ 55,265
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 15.39% 16.07%
Securities repurchase agreement obligations $ 945,050 $ 602,934
Corporate debt | Up to 30 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations 873,834 597,559
Corporate debt | 30-90 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations $ 71,216 $ 5,375
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 2.70% 1.52%
Securities repurchase agreement obligations $ 19,838 $ 17,637
U.S. sovereign debt | Up to 30 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations 19,838 17,637
U.S. sovereign debt | 30-90 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations $ 0 $ 0
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 1.00% 12.24%
Securities repurchase agreement obligations $ 17 $ 15,384
Corporate equity | Up to 30 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations 17 15,384
Corporate equity | 30-90 days    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Securities repurchase agreement obligations $ 0 $ 0