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FAIR VALUE OF FINANCIAL INSTRUMENTS: - Narrative (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Fair Value Disclosures [Abstract] |  |  |
Strategic investments without readily determinable fair values | $ 5,700,000 |  | $ 3,500,000
Asset impairment charges | $ 0 | $ 0 |

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