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
 6 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Up to 30 days $ 974,904 $ 840,082
30-90 days 6,286 142
Total contractual maturity $ 981,190 $ 840,224
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 14.48% 11.96%
Up to 30 days $ 508,658 $ 609,405
30-90 days 6,286 142
Total contractual maturity $ 514,944 $ 609,547
Non-US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 13.94% 10.85%
Up to 30 days $ 464,858 $ 222,893
30-90 days 0 0
Total contractual maturity $ 464,858 $ 222,893
U.S. sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 0.80% 0.77%
Up to 30 days $ 1,388 $ 7,396
30-90 days 0 0
Total contractual maturity $ 1,388 $ 7,396
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate   14.00%
Up to 30 days   $ 388
30-90 days   0
Total contractual maturity   $ 388