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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year $ 71,376 $ 65,279
Actual return on plan assets 1,824 4,733
Employer contributions 5,995 5,865
Plan participant contributions 3,522 3,020
Benefits paid (1,202) (5,214)
Administrative expenses paid (144) (132)
Currency exchange rate changes 3,347 (2,175)
Fair value of plan assets, end of year $ 84,718 $ 71,376