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Employee Benefit Obligations - Summary of Pension Plan Assets as of Measurement Date (Details)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	100.00%
Pension plan asset allocations	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocations	52.00%	50.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocations	19.00%	21.00%
Other plan asset investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocations	29.00%	29.00%
Minimum | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	0.00%
Minimum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	0.00%
Minimum | Other plan asset investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	0.00%
Maximum | Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	60.00%
Maximum | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	40.00%
Maximum | Other plan asset investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan asset allocation, target	100.00%

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- 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

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- 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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