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Pension And Other Postretirement Benefit Plans (Benefit Obligations, Plan Assets, And Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Plan assets at fair value, beginning of year $ 256,013    
Plan assets at fair value, end of year 221,953 $ 256,013  
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 235,540 269,758  
Projected benefit obligation 241,399 277,050 $ 297,090
Projected benefit obligation, beginning of year 277,050 297,090  
Service cost 6,172 6,674 6,618
Interest cost 9,670 8,754 9,571
Effect of discount rate change (31,621) (18,010)  
Foreign currency exchange rate changes (543) (1,160)  
Other (2,120) 1,736  
Benefit payments (17,209) (18,034)  
Projected benefit obligation, end of year 241,399 277,050 297,090
Plan assets at fair value, beginning of year 256,013 270,349  
Actual return on plan assets (20,613) 864  
Employer contributions 4,038 6,147  
Foreign currency exchange rate changes (276) (3,313)  
Plan assets at fair value, end of year 221,953 256,013 270,349
Funded status of the plans, end of year (19,446) (21,037)  
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 20,716 24,957 28,926
Projected benefit obligation, beginning of year 24,957 28,926  
Service cost 115 170 172
Interest cost 944 950 1,141
Effect of discount rate change (1,906) (1,549)  
Foreign currency exchange rate changes (145) 566  
Other (659) (1,245)  
Benefit payments (2,590) (2,861)  
Projected benefit obligation, end of year 20,716 24,957 28,926
Plan assets at fair value, beginning of year 2,706 3,033  
Actual return on plan assets 73 86  
Employer contributions 2,068 2,448  
Foreign currency exchange rate changes 0 0  
Plan assets at fair value, end of year 2,257 2,706 $ 3,033
Funded status of the plans, end of year $ (18,459) $ (22,251)