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Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Total investments $ 220,152 $ 217,859
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 65,637 43,807
Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 141,421 162,091
Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 13,094 11,961
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 193,852 185,025
Level 1 [Member] | Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 65,637 43,807
Level 1 [Member] | Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments 128,215 141,218
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 10,134 7,491
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 10,134 7,491
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 16,166 25,343
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 3,072 13,382
Level 3 [Member] | Alternative Investments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total investments $ 13,094 $ 11,961