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Pension And Other Postretirement Benefit Plans (Recognized In Accumulated Other Comprehensive Income (Loss) On Pretax Basis) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Settlement $ 14,100    
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (gain), beginning of year 63,428 $ 64,114  
Losses (gains) arising during the year 893 107  
Settlement (14,101) 0  
Amortization included in net periodic benefit cost during the year (170) (793)  
Net actuarial loss (gain), end of year 50,050 63,428 $ 64,114
Prior service cost (benefit), beginning of year 369 (457)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0 692  
Amortization included in net periodic benefit cost during the year 155 134  
Prior service cost (benefit), end of year 524 369 (457)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes 50,574 63,797  
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Net actuarial loss (gain), beginning of year (7,169) (8,332)  
Losses (gains) arising during the year (221) 377  
Settlement 0 0  
Amortization included in net periodic benefit cost during the year (658) (786)  
Net actuarial loss (gain), end of year (6,732) (7,169) (8,332)
Prior service cost (benefit), beginning of year (31) (36)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0   0
Amortization included in net periodic benefit cost during the year 4 5  
Prior service cost (benefit), end of year (27) (31) $ (36)
Total amounts in accumulated other comprehensive loss at end of year, before income taxes $ (6,759) $ (7,200)