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OTHER ACCRUED EXPENSES: | 3 Months Ended
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Jun. 30, 2018
Other Accrued Expenses [Abstract]. |
OTHER ACCRUED EXPENSES | OTHER ACCRUED EXPENSES: Other accrued expenses consist of the following (dollars in thousands):
|  | June 30, 2018 |  | March 31, 2018
Liabilities of non-qualified retirement plan |  | 14,344 |  |  | 13,551 |
Other accrued expenses |  | 44,594 |  |  | 42,314 |
Other accrued expenses |  | $ | 58,938 |  |  | $ | 55,865 |

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