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Net Gain on Trading Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Gain (Loss) on Investments [Abstract] |  |
Net gain recognized during the period on trading securities sold during the period | $ 22,770 | $ 25,535
Net unrealized gain/loss recognized during the reporting period on trading securities still held at the reporting date | (7,847) | (5,373)
Net gain recognized during the period on trading securities | $ 14,923 | $ 20,162

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- Definition Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI). + References No definition available. + Details
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