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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Mar. 31, 2015
Pension Benefits [Member]    
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:    
Aggregate projected benefit obligation $ 270,058 $ 283,070
Aggregate fair value of plan assets 210,368 216,815
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets:    
Aggregate accumulated benefit obligation 268,087 281,354
Aggregate fair value of plan assets 210,368 216,815
Other Postretirement Benefits [Member]    
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:    
Aggregate projected benefit obligation 37,225 40,863
Aggregate fair value of plan assets $ 1,565 $ 2,115