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Employee Benefit Plans (Projected Benefit Obligations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Changes in projected benefit obligations      
Projected benefit obligations, beginning of the year $ 160,914 $ 143,662  
Service costs 12,121 11,008 $ 10,564
Interest costs 1,047 1,055 1,301
Plan participant contributions 4,733 3,733  
Actuarial gains 15,762 2,246  
Benefits paid (3,947) (8,778)  
Transfer of prior vested benefits 7,556 5,271  
Plan amendment related to statutory change 0 0  
Settlement 0 (941)  
Administrative expense paid (130) (141)  
Currency exchange rate changes and other 4,292 3,799  
Projected benefit obligations, end of the year $ 202,348 $ 160,914 $ 143,662