Quarterly report pursuant to Section 13 or 15(d)

CASH AND CASH EQUIVALENTS - Schedule of collateralized securities received under reverse repurchase agreements (Details)

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CASH AND CASH EQUIVALENTS - Schedule of collateralized securities received under reverse repurchase agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Up to 30 days $ 2,658,067 $ 1,456,776
30-90 days 95,806 60,640
Total contractual maturity 2,753,873 1,517,416
Cash and cash equivalents    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Up to 30 days 72,112 29,627
30-90 days 0 185
Total contractual maturity $ 72,112 29,812
Corporate equity    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Up to 30 days   15,384
30-90 days   0
Total contractual maturity   $ 15,384
Corporate equity | Cash and cash equivalents    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 17.35% 17.17%
Up to 30 days $ 42,403 $ 6,963
30-90 days 0 0
Total contractual maturity 42,403 6,963
US sovereign debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Up to 30 days 3,766 17,637
30-90 days 0 0
Total contractual maturity $ 3,766 $ 17,637
US sovereign debt | Cash and cash equivalents    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 4.52% 2.06%
Up to 30 days $ 21,963 $ 17,102
30-90 days 0 0
Total contractual maturity 21,963 17,102
Corporate debt    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Up to 30 days 679,666 597,559
30-90 days 0 5,375
Total contractual maturity $ 679,666 $ 602,934
Corporate debt | Cash and cash equivalents    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 2.50% 2.52%
Up to 30 days $ 7,210 $ 2,079
30-90 days 0 185
Total contractual maturity $ 7,210 $ 2,264
Non-US sovereign debt | Cash and cash equivalents    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Average interest rate 15.50% 6.12%
Up to 30 days $ 536 $ 3,483
30-90 days 0 0
Total contractual maturity $ 536 $ 3,483