Employee Retirement Plans - Schedule of Health Care Cost Trend Rates (Details)	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure
Fiscal year that the rate reaches the ultimate trend rate	2019	2019
Maximum
Defined Benefit Plan Disclosure
Health care cost trend rate assumed for next year	7.00%	7.50%
Minimum
Defined Benefit Plan Disclosure
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00%	5.00%

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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

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

+ References

+ Details

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