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OTHER ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 31, 2019
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Other Accrued Expenses [Abstract]. |  |
Liabilities of non-qualified retirement plan | $ 14,746 | $ 14,970
Short-term lease liabilities | 8,443 | 0
PDP performance plan liability (see Note 7) | 6,799 | 0
DPM consideration holdback (see Note 7) | 2,060 | 0
Other miscellaneous accrued expenses | 23,676 | 25,946
Other accrued expenses | $ 55,724 | $ 40,916

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