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Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Ultimate healthcare cost trend rate 4.44%    
Year that rate reaches healthcare cost trend rate 2028    
Settlement cost $ (700)    
Net actuarial loss expected in net periodic benefit cost during next fiscal year 6,100    
Prior service benefit expected in net periodic benefit cost during next fiscal year $ 2,200    
Percentage of total plan assets 97.00%    
Percentage of total projected benefit obligation 85.00%    
Pension and Other Postretirement Benefits Cost (Reversal of Cost) $ 2,700 $ 2,600 $ 2,300
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Settlement cost (676) 0 $ 0
Funded status of the plans, end of year $ 48,632 $ 33,220  
Percentage of funded status of plans 71.00%    
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 7.34% 7.60% 8.10%
Settlement cost $ 0 $ 0 $ 0
Funded status of the plans, end of year $ 26,913 $ 27,918  
Percentage of funded status of plans 94.00%    
ERISA Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in next fiscal year $ 6,000    
Nonqualified Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in next fiscal year $ 4,000