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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2033
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Benefit Obligation, Payment for Settlement $ (47,000)      
Settlement 14,100      
Net actuarial loss expected in net periodic benefit cost during next fiscal year 300      
Prior service benefit expected in net periodic benefit cost during the next fiscal year $ 100      
Percentage of total plan assets 94.00%      
Percentage of total projected benefit obligation 79.00%      
Pension and Other Postretirement Benefits Cost (Reversal of Cost) $ 5,200 $ 4,300 $ 3,400  
Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 11,300      
ERISA Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 0      
Pension Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded status of the plans, end of year 16,887 17,290    
Settlement (14,101) $ 0    
Pension Benefits [Member] | Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded status of the plans, end of year $ 28,400      
Other Postretirement Benefits [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Revised healthcare cost trend assumption 8.08% 6.97% 6.97%  
Year that rate reaches healthcare cost trend rate 2033      
Funded status of the plans, end of year $ 16,597 $ 18,143    
Settlement 0 $ 0    
Other Postretirement Benefits [Member] | Nonqualified Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Funded status of the plans, end of year $ 14,800      
Other Postretirement Benefits [Member] | Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Revised healthcare cost trend assumption       4.44%