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OTHER ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Liabilities of non-qualified retirement plan | $ 14,793 | $ 11,623
PDP performance plan liability (see Note 6) | 10,839 | 16,318
DPM consideration holdback (see Note 6) | 0 | 6,185
Other miscellaneous accrued expenses | 23,383 | 25,224
Other accrued expenses | 58,532 | 68,991
Accrued Liabilities |  |
Lessee, Lease, Description [Line Items] |  |
Short-term lease liabilities (see Note 4) | $ 9,517 | $ 9,641

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