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OTHER ACCRUED EXPENSES: (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Mar. 31, 2019
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Liabilities of non-qualified retirement plan | $ 11,623 | $ 14,970
PDP performance plan liability (see Note 13) | 16,318 | 0
DPM consideration holdback (see Note 13) | 6,185 | 0
Other miscellaneous accrued expenses | 25,224 | 25,946
Other accrued expenses | 68,991 | 40,916
Accrued Liabilities |  |
Lessee, Lease, Description [Line Items] |  |
Short-term lease liabilities (See Note 2) | $ 9,641 | $ 0

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