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NET GAIN ON TRADING SECURITIES - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) investor shares | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) investor shares | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Portfolio shares SPBX | $ 7,182 |  | $ 7,182 |  | $ 18,371
Number of equity securities exchanged | shares | 1,000,000 |  | 12,500,000 |  |
Number Of Investors | investor | 490 |  | 15,490 |  |
Proceeds from the sale of equity securities | $ 11,338 |  | $ 167,011 |  |
Shares issued during the period (in shares) | shares | 2,423,000 |  |  |  |
Net proceeds from issuance of shares during the period | $ 32,858 |  |  |  |
Gain on sale of equity securities | 39,658 |  |  |  |
Unrealized gain on the sale of equity securities | 36,079 |  |  |  |
Realized net gain on sale of equity securities | $ 41,386 | $ 6,571 | 189,783 | $ 13,563 |
Realized gain on the sale of equity securities |  |  | $ 177,146 |  |

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