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Benefit Plans Asset Holdings (Details)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure
Target Allocation	100.00%
Plan Asset Allocations	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure
New Policy Target Allocation	47.00%
Target Allocation	32.00%
Plan Asset Allocations	38.00%	43.00%
Private equity funds
Defined Benefit Plan Disclosure
Target Allocation	10.00%
Plan Asset Allocations	5.00%	5.00%
Low volatility global public equity [Member]
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	5.00%	1.00%
Cash
Defined Benefit Plan Disclosure
Target Allocation	2.00%
Plan Asset Allocations	2.00%	2.00%
Core fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	5.00%	5.00%
Long-term core fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	5.00%	5.00%
Investment grade credit
Defined Benefit Plan Disclosure
Target Allocation	6.00%
Plan Asset Allocations	6.00%	6.00%
International emerging markets fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	5.00%	5.00%
High yield fixed income
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	6.00%	6.00%
Global TIPS
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	6.00%	5.00%
Private real assets
Defined Benefit Plan Disclosure
New Policy Target Allocation	10.00%
Target Allocation	10.00%
Plan Asset Allocations	9.00%	7.00%
Commodities
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	4.00%	4.00%
MLPs
Defined Benefit Plan Disclosure
Target Allocation	5.00%
Plan Asset Allocations	4.00%	6.00%
Fixed income
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.

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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 5



-Subparagraph (c)(i)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920



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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



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