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OTHER ACCRUED EXPENSES: (Tables)
 12 Months Ended
Mar. 31, 2019
Other Accrued Expenses [Abstract].  
Schedule of other accrued expenses
Other accrued expenses consist of the following (dollars in thousands):
 March 31, March 31, 
 20192018
Liabilities of non-qualified retirement plan (see Note 6 - Other Current and Noncurrent Assets)$14,970 $13,551 
Other accrued expenses25,946 26,073 
Other accrued expenses$40,916 $39,624