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Employee Benefit Plans (Projected Benefit Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Changes in projected benefit obligations      
Projected benefit obligations, beginning of the year $ 120,473 $ 113,323  
Service costs 10,385 10,117 $ 7,646
Interest costs 800 1,147 1,970
Plan participant contributions 3,020 2,990  
Actuarial (gains) losses (11,081) (2,496)  
Benefits paid (5,214) (5,277)  
Plan amendment related to statutory change 65 0  
Administrative expense paid (132) 0  
Currency exchange rate changes (3,676) 669  
Projected benefit obligations, end of the year $ 114,640 $ 120,473 $ 113,323