Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 224,553	$ 213,282
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	51,300	93,229
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	161,817	100,120
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	11,436	19,933
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	192,955	173,796
Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	51,300	93,229
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	141,655	80,567
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	7,738	8,287
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	7,738	8,287
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	23,860	31,199
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	12,424	11,266
Level 3 [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 11,436	$ 19,933