Pension And Other Postretirement Benefit Plans (Assumptions Used To Compute Net Periodic Benefit Cost And Benefit Obligations) (Details)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Healthcare cost trend rate	7.20%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates: Benefit cost for plan year	4.50%	4.20%	4.60%
Discount rates: Benefit obligation at end of plan year	3.80%	4.50%	4.20%
Expected long-term return on plan assets: Benefit cost for plan year	7.75%	8.00%	8.00%
Expected long-term return on plan assets: Benefit obligation at end of plan year	7.25%	7.75%	8.00%
Salary scale: Benefit cost for plan year	4.50%	5.00%	5.00%
Salary scale: Benefit obligation at end of plan year	4.50%	4.50%	5.00%
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates: Benefit cost for plan year	4.10%	3.90%	4.40%
Discount rates: Benefit obligation at end of plan year	3.70%	4.30%	3.90%
Expected long-term return on plan assets: Benefit cost for plan year	4.30%	4.30%	4.30%
Expected long-term return on plan assets: Benefit obligation at end of plan year	3.00%	4.30%	4.30%
Salary scale: Benefit cost for plan year	4.50%	5.00%	5.00%
Salary scale: Benefit obligation at end of plan year	4.50%	4.50%	5.00%
Healthcare cost trend rate	7.20%	7.40%	7.60%

The interest rate used to adjust for the time value of money for the plan.

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

+ Details

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- Definition

The interest rate used to adjust for the time value of money.

+ References

+ Details

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

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- Definition

Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Expected Long Term Return On Assets

+ References

No definition available.

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