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NET GAIN ON TRADING SECURITIES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Debt Securities, Available-for-Sale [Line Items] |  |  |
Equity securities FVNI portfolio shares SPBX | $ 478 | $ 18,408 | $ 11,259
Number of equity shares exchanged (in shares) | 7,500,000 |  |
Debt securities, trading, realized gain (loss) | $ 36,226 | (206,239) | (20,135)
Debt Securities, Trading, Unrealized Gain (Loss) | (107,310) | 50,987 | (8,672)
Net gain on trading securities | 71,084 | $ 155,252 | $ 28,807
SBPX Shares |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Debt securities, trading, realized gain (loss) | 73,384 |  |
Debt Securities, Trading, Unrealized Gain (Loss) | $ 50,785 |  |

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- Definition Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27476-111563 + Details
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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- Definition Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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