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NET GAIN ON TRADING SECURITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
NET GAIN ON TRADING SECURITIES        
Net gain recognized during the period on trading securities sold during the period 143,724 5,883 149,536 17,123
Net unrealized gain/(loss) recognized during the reporting period on trading securities still held at the reporting date $ 31,528 $ 2,419 $ 35,616 $ 263
Net gain recognized during the period on trading securities $ 175,252 $ 8,302 $ 185,152 $ 17,386