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Employee Retirement Plans (Expected Return on Plan Assets) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Interest cost $ 610 $ 634 $ 1,220 $ 1,263
Expected return on assets (768) (725) (1,536) (1,451)
Net periodic benefit income $ (158) $ (91) $ (316) $ (188)