SECURITIES REPURCHASE AGREEMENT OBLIGATIONS - Schedule of trading securities including collateralized securities subject to repurchase agreements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Up to 30 days	$ 973,443	$ 872,550
30-90 days	56,728	142
Total contractual maturity	$ 1,030,171	$ 872,692
Non-US sovereign debt
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	12.16%	10.85%
Up to 30 days	$ 580,250	$ 222,892
30-90 days	37,882	0
Total contractual maturity	$ 618,132	$ 222,892
Corporate debt
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	13.67%	12.07%
Up to 30 days	$ 392,091	$ 641,550
30-90 days	18,846	142
Total contractual maturity	$ 410,937	$ 641,692
Corporate equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	8.64%	13.54%
Up to 30 days	$ 1,102	$ 712
30-90 days	0	0
Total contractual maturity	$ 1,102	$ 712
U.S. sovereign debt
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate		0.77%
Up to 30 days		$ 7,396
30-90 days		0
Total contractual maturity		$ 7,396