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Employee Benefit Obligations - Summary of Pension Plan Assets as of Measurement Date (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013
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 | 27.00% | 52.00%
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plan asset allocations | 28.00% | 19.00%
Other plan asset investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension plan asset allocations | 45.00% | 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=35743120&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=35743120&loc=d3e2446-114920 + Details
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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=35743120&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=35743120&loc=d3e1928-114920 + Details
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