CASH AND CASH EQUIVALENTS - Schedule of collateralized securities received under reverse repurchase agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026
Cash and cash equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Up to 30 days	$ 58,782	$ 207,893
Total	$ 58,782	$ 207,893
Non-US sovereign debt
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	16.64%	17.87%
Non-US sovereign debt \| Cash and cash equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	4.93%	13.15%
Up to 30 days	$ 46,615	$ 66,295
Total	$ 46,615	$ 66,295
Corporate equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	2.84%	16.25%
Corporate equity \| Cash and cash equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	16.17%	17.78%
Up to 30 days	$ 9,625	$ 127,652
Total	$ 9,625	$ 127,652
Corporate debt
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	16.93%	17.78%
Corporate debt \| Cash and cash equivalents
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average interest rate	11.51%	7.79%
Up to 30 days	$ 2,542	$ 13,946
Total	$ 2,542	$ 13,946

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details