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Employee Retirement Plans (Periodic Service Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Change in benefit obligation:    
Projected benefit obligation at beginning of period $ 61,714 $ 61,187
Interest cost 2,529 456
Actuarial loss 800 791
Benefits paid (3,161) (720)
Projected benefit obligations at end of year 61,882 61,714
Change in plan assets:    
Fair value of plan assets at beginning of period 47,772 41,560
Actual return on plan assets 5,505 854
Employer contribution 392 6,078
Benefits paid (3,161) (720)
Fair value of plan assets at end of year 50,508 47,772
Funded status at end of year $ (11,374) $ (13,942)