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TRADING AND AVAILABLE FOR SALE SECURITIES AT FAIR VALUE - Schedule of maturity of trading and available-for-sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Mar. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | $ 284,580 | $ 216,621
Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 184,556 | 173,568
Non-US sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 78,446 | 27,016
U.S. sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 21,578 | 16,037
Up to 1 year |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 47,159 | 73,254
Up to 1 year | Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 29,395 | 65,415
Up to 1 year | Non-US sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 17,764 | 7,839
Up to 1 year | U.S. sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 0 | 0
1-5 years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 128,087 | 56,743
1-5 years | Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 98,466 | 44,374
1-5 years | Non-US sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 17,675 | 7,310
1-5 years | U.S. sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 11,946 | 5,059
5-10 years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 96,881 | 75,103
5-10 years | Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 52,424 | 59,553
5-10 years | Non-US sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 36,100 | 5,797
5-10 years | U.S. sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 8,357 | 9,753
More than 10 years |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 12,453 | 11,521
More than 10 years | Corporate debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 4,271 | 4,226
More than 10 years | Non-US sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | 6,907 | 6,070
More than 10 years | U.S. sovereign debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of equity securities | $ 1,275 | $ 1,225

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