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Employee Benefit Plans (Plan Asset Details) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Defined benefit plans      
Fair value of plan assets $ 156,118 $ 128,061 $ 98,010
Level 1      
Defined benefit plans      
Fair value of plan assets 134,601 116,692  
Level 2      
Defined benefit plans      
Fair value of plan assets 21,517 11,369  
Cash and cash equivalents      
Defined benefit plans      
Fair value of plan assets 16,317 21,715  
Cash and cash equivalents | Level 1      
Defined benefit plans      
Fair value of plan assets 16,317 21,715  
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 48,591 38,437  
Equity securities | Level 1      
Defined benefit plans      
Fair value of plan assets 48,591 38,437  
Equity securities | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Debt securities      
Defined benefit plans      
Fair value of plan assets 38,513 31,034  
Debt securities | Level 1      
Defined benefit plans      
Fair value of plan assets 38,513 31,034  
Debt securities | Level 2      
Defined benefit plans      
Fair value of plan assets 0 0  
Real estate funds      
Defined benefit plans      
Fair value of plan assets 38,223 29,143  
Real estate funds | Level 1      
Defined benefit plans      
Fair value of plan assets 25,146 20,802  
Real estate funds | Level 2      
Defined benefit plans      
Fair value of plan assets 13,077 8,341  
Hedge funds      
Defined benefit plans      
Fair value of plan assets 8,076 2,730  
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 8,076 2,730  
Other      
Defined benefit plans      
Fair value of plan assets 6,398 5,002  
Other | Level 1      
Defined benefit plans      
Fair value of plan assets 6,034 4,704  
Other | Level 2      
Defined benefit plans      
Fair value of plan assets $ 364 $ 298