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FAIR VALUE OF FINANCIAL INSTRUMENTS: - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Fair Value Disclosures [Abstract] |  |  |
Strategic investments without readily determinable fair values | $ 5,700,000 | $ 3,500,000 |
Asset impairment charges | $ 0 | $ 0 | $ 0

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