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CASH AND CASH EQUIVALENTS - Schedule of collateralized securities received under reverse repurchase agreements (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Mar. 31, 2025
--- | --- | ---
Cash and cash equivalents |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Up to 30 days | $ 100,375 | $ 81,118
30-90 days | 4,940 |
Total | $ 105,315 | $ 81,118
Non-US sovereign debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 15.47% | 15.74%
Non-US sovereign debt | Cash and cash equivalents |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 12.98% | 4.48%
Up to 30 days | $ 75,442 | $ 4,436
30-90 days | 4,940 |
Total | $ 80,382 | $ 4,436
Corporate equity |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 16.00% | 3.25%
Corporate equity | Cash and cash equivalents |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 13.80% | 17.05%
Up to 30 days | $ 19,408 | $ 58,202
30-90 days | 0 |
Total | $ 19,408 | $ 58,202
Corporate debt |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 15.96% | 15.95%
Corporate debt | Cash and cash equivalents |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 10.14% | 13.27%
Up to 30 days | $ 4,478 | $ 16,644
30-90 days | 0 |
Total | $ 4,478 | $ 16,644
U.S. sovereign debt | Cash and cash equivalents |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Average interest rate | 3.50% | 16.75%
Up to 30 days | $ 1,047 | $ 1,836
30-90 days | 0 |
Total | $ 1,047 | $ 1,836

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