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NET INTEREST INCOME/EXPENSE (Tables) | 12 Months Ended
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Mar. 31, 2024
Interest Income (Expense), Net [Abstract] |
Interest Income and Interest Expense Disclosure | Net interest income/expense includes:
| Year ended March 31, 2024 |  | Year ended March 31, 2023 |  | Year ended March 31, 2022
Interest income: |  |  |  |  |
Interest income on trading securities | $ | 426,428 |  |  | $ | 178,288 |  |  | $ | 78,327 |
Interest income on loans to customers | 176,539 |  |  | 43,486 |  |  | 4,617 |
Interest income on margin loans to customers | 175,571 |  |  | 34,558 |  |  | 14,164 |
Interest income on securities available-for-sale | 32,821 |  |  | 27,003 |  |  | 22,437 |
Interest income on reverse repurchase agreements and amounts due from banks | 16,865 |  |  | 9,836 |  |  | 1,658 |
Other interest income | — |  |  | 1,524 |  |  | 406 |
Total interest income | $ | 828,224 |  |  | $ | 294,695 |  |  | $ | 121,609 |
Interest expense: |  |  |  |  |
Interest expense on securities repurchase agreement obligations | $ | 402,665 |  |  | $ | 158,595 |  |  | $ | 58,229 |
Interest expense on customer accounts and deposits | 70,778 |  |  | 40,335 |  |  | 16,336 |
Interest expense on margin lending payable | 16,990 |  |  | 6,635 |  |  | — |
Interest expense on debt securities issued | 10,356 |  |  | 3,085 |  |  | 1,822 |
Other interest expense | 322 |  |  | 297 |  |  | 560 |
Total interest expense | $ | 501,111 |  |  | $ | 208,947 |  |  | $ | 76,947 |
Net interest income | $ | 327,113 |  |  | $ | 85,748 |  |  | $ | 44,662 |

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