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NET GAIN ON TRADING SECURITIES - Summary of net gain on trading securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Net gain recognized during the period on trading securities sold during the period | $ 44,920 | $ 2,400 | $ 52,786 | $ 15,241
Net unrealized (loss)/gain recognized during the reporting period on trading securities still held at the reporting date | (7,816) | 65,917 | 29,920 | 974
Net gain recognized during the period on trading securities | $ 37,104 | $ 68,317 | $ 82,706 | $ 16,215

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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/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-14 + Details
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