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Employee Retirement Plans - Pension Plans (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014
Pension Benefit |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 100.00% | 100.00%
Target Asset Allocation | 100.00% |
Pension Benefit | Equity Securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 66.40% | 66.90%
Target Asset Allocation | 65.00% |
Permitted Range - Minimum | 60.00% |
Permitted Range - Maximum | 70.00% |
Pension Benefit | Domestic equity investments: |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 56.20% | 55.60%
Target Asset Allocation | 52.50% |
Permitted Range - Minimum | 40.00% |
Permitted Range - Maximum | 65.00% |
Pension Benefit | International Index Equity Mutual Funds |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 10.20% | 11.30%
Target Asset Allocation | 12.50% |
Permitted Range - Minimum | 7.50% |
Permitted Range - Maximum | 17.50% |
Pension Benefit | Fixed Income Funds And Cash Equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 33.60% | 33.10%
Target Asset Allocation | 35.00% |
Permitted Range - Minimum | 30.00% |
Permitted Range - Maximum | 40.00% |
VEBA Trust |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 100.00% | 100.00%
Target Asset Allocation | 100.00% |
VEBA Trust | Domestic equity investments: |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 67.40% | 67.90%
Target Asset Allocation | 65.00% |
Permitted Range - Minimum | 60.00% |
Permitted Range - Maximum | 70.00% |
VEBA Trust | Fixed Income Funds And Cash Equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual Pension Plan | 32.60% | 32.10%
Target Asset Allocation | 35.00% |
Permitted Range - Minimum | 30.00% |
Permitted Range - Maximum | 40.00% |

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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 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&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)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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