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FAIR VALUE OF FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
--- | --- | ---
Fair value of assets and liabilities |  |
Other current assets | $ 51,055 | $ 44,150
Fair value measurements on recurring basis | Total |  |
Fair value of assets and liabilities |  |
Other current assets | 14,746 |
Total assets | 14,746 |
Fair value measurements on recurring basis | Total | Level 1 |  |
Fair value of assets and liabilities |  |
Other current assets | 14,746 |
Total assets | 14,746 |
Fair value measurements on recurring basis | Total | Level 2 |  |
Fair value of assets and liabilities |  |
Other current assets | 0 |
Total assets | 0 |
Fair value measurements on recurring basis | Total | Level 3 |  |
Fair value of assets and liabilities |  |
Other current assets | 0 |
Total assets | $ 0 |

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