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Employee Retirement Plans - Pension Plans (Details) | Sep. 30, 2017 | Sep. 30, 2016
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U.S. Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Percentage of common stock represented pension plan assets | 7.70% | 8.00%
Pension Benefits | U.S. Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 100.00% | 100.00%
Target Asset Allocation | 100.00% |
Pension Benefits | U.S. Pension Plan | Equity investments |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 67.60% | 64.30%
Target Asset Allocation | 65.00% |
Pension Benefits | U.S. Pension Plan | Equity investments | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 60.00% |
Pension Benefits | U.S. Pension Plan | Equity investments | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 70.00% |
Pension Benefits | U.S. Pension Plan | Domestic |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 55.20% | 54.10%
Target Asset Allocation | 52.50% |
Pension Benefits | U.S. Pension Plan | Domestic | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 40.00% |
Pension Benefits | U.S. Pension Plan | Domestic | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 65.00% |
Pension Benefits | U.S. Pension Plan | International |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 12.40% | 10.20%
Target Asset Allocation | 12.50% |
Pension Benefits | U.S. Pension Plan | International | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 7.50% |
Pension Benefits | U.S. Pension Plan | International | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 17.50% |
Pension Benefits | U.S. Pension Plan | Fixed income funds & cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 32.40% | 35.70%
Target Asset Allocation | 35.00% |
Pension Benefits | U.S. Pension Plan | Fixed income funds & cash equivalents | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 30.00% |
Pension Benefits | U.S. Pension Plan | Fixed income funds & cash equivalents | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 40.00% |
VEBA |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 100.00% | 100.00%
Target Asset Allocation | 100.00% |
VEBA | Domestic |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 63.10% | 69.90%
Target Asset Allocation | 65.00% |
VEBA | Domestic | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 60.00% |
VEBA | Domestic | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 70.00% |
VEBA | Fixed income funds & cash equivalents |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Actual | 36.90% | 30.10%
Target Asset Allocation | 35.00% |
VEBA | Fixed income funds & cash equivalents | Minimum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 30.00% |
VEBA | Fixed income funds & cash equivalents | Maximum |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Target Asset Allocation | 40.00% |

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- Definition Net costs for unfunded and non qualified supplemental executive retirement plans. + References No definition available. + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + 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)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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=82843861&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=82843861&loc=d3e1928-114920 + Details
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