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Employee Retirement Plans (Amounts Recognized in the Balance Sheet) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Current liability $ 361 $ 461
Long-term liability 8,858 10,913
Total $ 9,219 $ 11,374