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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Pension Benefits [Member]
   
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:    
Aggregate projected benefit obligation $ 294,325 $ 257,240
Aggregate fair value of plan assets 189,795 189,378
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets:    
Aggregate accumulated benefit obligation 270,569 232,342
Aggregate fair value of plan assets 189,795 189,378
Other Postretirement Benefits [Member]
   
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:    
Aggregate projected benefit obligation 48,784 43,888
Aggregate fair value of plan assets $ 3,062 $ 3,284