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Employee Retirement Plans (Expected Return on Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 456  
Expected return on assets (462)  
Net periodic benefit cost (income) (6)  
Pension plan    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 456  
Net periodic benefit cost (income) (1,000)  
Defined benefit obligation $ 61,714 $ 61,187