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Employee Retirement Plans (Periodic Service Costs) (Details)
$ in Thousands
 12 Months Ended
Mar. 31, 2017
USD ($)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Interest cost $ 456
Funded status at end of year (6,000)
Pension plan  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]  
Projected benefit obligation at date of acquisition 61,187
Interest cost 456
Actuarial (gain) loss 791
Benefits paid (720)
Funded status at end of year (13,942)
Projected benefit obligations at end of year 61,714
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]  
Fair value of plan assets at date of acquisition 41,560
Actual return on plan assets 854
Employer contribution 6,078
Benefits paid (720)
Fair value of plan assets at end of year $ 47,772