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FAIR VALUE OF FINANCIAL INSTRUMENTS: - Narrative (Details) - USD ($)
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2021
Fair Value Disclosures [Abstract]      
Strategic investments without readily determinable fair values $ 5,700,000   $ 5,700,000
Asset impairment charges $ 0 $ 0