Pension And Other Postretirement Benefit Plans (Fair Values Of Assets Under Fair Value Hierarchy) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 205,942	$ 199,525
Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	83,233	81,445
International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	23,931	20,935
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	79,288	79,261
Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	8,933	8,358
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	10,557	9,526
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	168,717	68,430
Level 1 [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	83,233	26,025
Level 1 [Member] | International Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	23,931	20,935
Level 1 [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	61,553	21,470
Level 1 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 1 [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	10,300	107,128
Level 2 [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	55,420
Level 2 [Member] | International 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	10,300	51,708
Level 2 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 2 [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	26,925	23,967
Level 3 [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	0	0
Level 3 [Member] | International 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	7,435	6,083
Level 3 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	8,933	8,358
Level 3 [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total investments	$ 10,557	$ 9,526