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Employee Benefit Plans (Plan Asset Details) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Defined benefit plans      
Fair value of plan assets $ 98,010 $ 90,365 $ 84,718
Level 1      
Defined benefit plans      
Fair value of plan assets 87,707 89,155  
Level 2      
Defined benefit plans      
Fair value of plan assets 10,303 1,210  
Cash and cash equivalents      
Defined benefit plans      
Fair value of plan assets 14,213 10,737  
Cash and cash equivalents | Level 1      
Defined benefit plans      
Fair value of plan assets 14,213 10,737  
Cash and cash equivalents | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Equity securities      
Defined benefit plans      
Fair value of plan assets 28,329 27,559  
Equity securities | Level 1      
Defined benefit plans      
Fair value of plan assets 28,329 27,559  
Equity securities | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Debt securities      
Defined benefit plans      
Fair value of plan assets 26,605 26,823  
Debt securities | Level 1      
Defined benefit plans      
Fair value of plan assets 26,605 26,823  
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 24,644 21,659  
Swiss real estate funds | Level 1      
Defined benefit plans      
Fair value of plan assets 16,476 21,659  
Swiss real estate funds | Level 2      
Defined benefit plans      
Fair value of plan assets 8,168 0  
Hedge funds      
Defined benefit plans      
Fair value of plan assets 1,882 912  
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 1,882 912  
Other      
Defined benefit plans      
Fair value of plan assets 2,337 2,675  
Other | Level 1      
Defined benefit plans      
Fair value of plan assets 2,084 2,377  
Other | Level 2      
Defined benefit plans      
Fair value of plan assets $ 253 $ 298