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Pension And Other Postretirement Benefit Plans (Additional Information On Funded Status) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits [Member]
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:
Aggregate projected benefit obligation	$ 290,142	$ 294,325
Aggregate fair value of plan assets	195,642	189,795
For Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets:
Aggregate accumulated benefit obligation	272,148	270,569
Aggregate fair value of plan assets	195,642	189,795
Other Postretirement Benefits [Member]
For Plans With A Projected Benefit Obligation In Excess Of Plan Assets:
Aggregate projected benefit obligation	48,970	48,784
Aggregate fair value of plan assets	$ 2,932	$ 3,062

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details