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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Pension Benefits [Member]    
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:    
Aggregate projected benefit obligation $ 260,826 $ 270,058
Aggregate fair value of plan assets 210,017 210,368
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets:    
Aggregate accumulated benefit obligation 258,424 268,087
Aggregate fair value of plan assets 210,017 210,368
Other Postretirement Benefits [Member]    
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:    
Aggregate projected benefit obligation 36,786 37,225
Aggregate fair value of plan assets $ 3,054 $ 1,565