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Benefit Plans Asset Holdings (Details)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Equity securities
Defined Benefit Plan Disclosure
New Policy Target Allocation	47.00%
Target Allocation	32.00%
Plan Asset Allocations	48.00%	47.00%
Private equity funds
Defined Benefit Plan Disclosure
Target Allocation	10.00%
Plan Asset Allocations	6.00%	6.00%
Low volatility global public equity [Member]
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	0.00%	0.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure
Target Allocation	2.00%
Plan Asset Allocations	2.00%	1.00%
Core fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	5.00%	8.00%
Long-term core fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	4.00%	4.00%
Investment grade credit
Defined Benefit Plan Disclosure
Target Allocation	6.00%
Plan Asset Allocations	6.00%	9.00%
Foreign Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	0.00%	0.00%
High yield fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	10.00%	10.00%
Global TIPS
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	7.00%	9.00%
Private real assets
Defined Benefit Plan Disclosure
New Policy Target Allocation	10.00%
Target Allocation	10.00%
Plan Asset Allocations	7.00%	6.00%
Commodities
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	0.00%	0.00%
MLPs
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	5.00%	0.00%
Debt securities
Defined Benefit Plan Disclosure
New Policy Target Allocation	28.00%
Public real assets
Defined Benefit Plan Disclosure
New Policy Target Allocation	15.00%

X

- Definition

New policy target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

No definition available.

+ Details

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X

- Details

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X

- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ 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 (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

+ Details

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X

- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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