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Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Total investments $ 229,568 $ 220,151
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 58,667 65,637
Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 156,715 141,420
Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 14,186 13,094
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 200,996 193,851
Level 1 [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 58,667 65,637
Level 1 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 142,329 128,214
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 10,836 10,134
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 10,836 10,134
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 17,736 16,166
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 3,550 3,072
Level 3 [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments $ 14,186 $ 13,094