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Employee Benefit Plans (Plan Asset Details) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Defined benefit plans      
Fair value of plan assets $ 84,718 $ 71,376 $ 65,279
Level 1      
Defined benefit plans      
Fair value of plan assets 84,404 67,575  
Level 2      
Defined benefit plans      
Fair value of plan assets 314 3,801  
Cash and cash equivalents      
Defined benefit plans      
Fair value of plan assets 18,355 11,910  
Cash and cash equivalents | Level 1      
Defined benefit plans      
Fair value of plan assets 18,331 11,864  
Cash and cash equivalents | Level 2      
Defined benefit plans      
Fair value of plan assets 24 46  
Equity securities      
Defined benefit plans      
Fair value of plan assets 26,204 20,985  
Equity securities | Level 1      
Defined benefit plans      
Fair value of plan assets 26,204 20,985  
Equity securities | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Debt securities      
Defined benefit plans      
Fair value of plan assets 25,150 22,373  
Debt securities | Level 1      
Defined benefit plans      
Fair value of plan assets 25,150 22,373  
Debt securities | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Swiss real estate funds      
Defined benefit plans      
Fair value of plan assets 12,096 9,699  
Swiss real estate funds | Level 1      
Defined benefit plans      
Fair value of plan assets 12,096 9,699  
Swiss real estate funds | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Hedge funds      
Defined benefit plans      
Fair value of plan assets 0 3,507  
Hedge funds | Level 1      
Defined benefit plans      
Fair value of plan assets 0 0  
Hedge funds | Level 2      
Defined benefit plans      
Fair value of plan assets 0 3,507  
Insurance contracts      
Defined benefit plans      
Fair value of plan assets 32 61  
Insurance contracts | Level 1      
Defined benefit plans      
Fair value of plan assets 0 0  
Insurance contracts | Level 2      
Defined benefit plans      
Fair value of plan assets 32 61  
Other      
Defined benefit plans      
Fair value of plan assets 2,881 2,841  
Other | Level 1      
Defined benefit plans      
Fair value of plan assets 2,623 2,654  
Other | Level 2      
Defined benefit plans      
Fair value of plan assets $ 258 $ 187