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Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Total investments $ 171,031 $ 220,336
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 45,008 56,243
Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 113,480 151,435 [1]
Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 12,543 12,658
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 149,079 199,983
Level 1 [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 45,008 56,243
Level 1 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 104,071 143,740 [1]
Level 1 [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 0 0
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 0 0
Level 2 [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 0 0
Level 2 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 0 0 [1]
Level 2 [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 0 0
Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 21,952 20,353
Level 3 [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 0 0
Level 3 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 9,409 7,695 [1]
Level 3 [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments $ 12,543 $ 12,658
[1] Includes high yield securities and cash and cash equivalent balances.