Annual report pursuant to Section 13 and 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
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations $ 2,756,596 $ 1,517,416 $ 840,224
Up to 30 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations 2,482,004 1,456,776  
30-90 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations $ 274,592 $ 60,640  
Non-U.S. sovereign debt      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average interest rate (in percent) 13.78% 15.98%  
Securities repurchase agreement obligations $ 1,805,028 $ 881,461  
Non-U.S. sovereign debt | Up to 30 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations 1,545,080 826,196  
Non-U.S. sovereign debt | 30-90 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations $ 259,948 $ 55,265  
Corporate debt      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average interest rate (in percent) 13.84% 16.07%  
Securities repurchase agreement obligations $ 938,396 $ 602,934  
Corporate debt | Up to 30 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations 923,752 597,559  
Corporate debt | 30-90 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations $ 14,644 $ 5,375  
US sovereign debt      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Average interest rate (in percent) 3.06% 1.52%  
Securities repurchase agreement obligations $ 13,172 $ 17,637  
US sovereign debt | Up to 30 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations 13,172 17,637  
US 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 (in percent)   12.24%  
Securities repurchase agreement obligations   $ 15,384  
Corporate equity | Up to 30 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations   15,384  
Corporate equity | 30-90 days      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Securities repurchase agreement obligations   $ 0