| Schedule of securities under repurchase agreement obligations | As of September 30, 2023, and March 31, 2023, trading securities included collateralized securities subject to repurchase agreements as described in the following table: 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | September 30, 2023 |  
|  | Interest rates and remaining contractual maturity of the agreements |  
|  | 
Average interest rate 
 |  | Up to 30 days |  | 30-90 days |  | Total |  
| 
Securities sold under repurchase agreements 
 |  |  |  |  |  |  |  |  
| Non-US sovereign debt | 16.73 | % |  | $ | 1,974,635 |  |  | $ | 95,806 |  |  | $ | 2,070,441 |  |  
| Corporate debt | 16.17 | % |  | 679,666 |  |  | — |  |  | 679,666 |  |  
| US sovereign debt | 1.92 | % |  | 3,766 |  |  | — |  |  | 3,766 |  |  
| Total securities sold under repurchase agreements |  |  | $ | 2,658,067 |  |  | $ | 95,806 |  |  | $ | 2,753,873 |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  
|  | March 31, 2023  |  
|  | Interest rate and remaining contractual maturity of the agreements |  
|  | 
Average interest rate 
 |  | Up to 30 days |  | 30-90 days |  | Total |  
| Non-US sovereign debt | 15.98 | % |  | $ | 826,196 |  |  | $ | 55,265 |  |  | $ | 881,461 |  |  
| Corporate debt | 16.07 | % |  | 597,559 |  |  | 5,375 |  |  | 602,934 |  |  
| US sovereign debt | 1.52 | % |  | 17,637 |  |  | — |  |  | 17,637 |  |  
| Corporate equity | 12.24 | % |  | 15,384 |  |  | — |  |  | 15,384 |  |  
|  |  |  |  |  |  |  |  |  
| Total securities sold under repurchase agreements |  |  | $ | 1,456,776 |  |  | $ | 60,640 |  |  | $ | 1,517,416 |  |  |