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NET GAIN ON TRADING SECURITIES - Summary of net gain on trading securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Realized net gain on sale of equity securities | $ 41,386 | $ 6,571 | $ 189,783 | $ 13,563
Debt Securities, Trading, Unrealized Gain (Loss) | (34,372) | 7,401 | 5,487 | 5,680
Net gain on trading securities | $ 7,014 | $ 13,972 | $ 195,270 | $ 19,243

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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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27476-111563 + 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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27357-111563 + Details
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