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Employee Retirement Plans - Pension Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Pension Benefit |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Actual Pension Plan | 100.00% | 100.00% |
Target Asset Allocation | 100.00% |  |
Pension and Other Postretirement Benefit Contributions, Fair Value | $ 459.4 | $ 415.3 | $ 369.9
Pension Benefit | Equity Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Actual Pension Plan | 66.90% | 68.60% |
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 | 55.60% | 57.50% |
Target Asset Allocation | 52.50% |  |
Permitted Range - Minimum | 40.00% |  |
Permitted Range - Maximum | 65.00% |  |
Pension Benefit | International Index Mutual Funds |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Actual Pension Plan | 11.30% | 11.10% |
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 | 33.10% | 31.40% |
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% |  |
Pension and Other Postretirement Benefit Contributions, Fair Value | 12.8 | 11.7 |
VEBA Trust | Domestic Equity Investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Actual Pension Plan | 67.90% | 65.60% |
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 | 32.10% | 34.40% |
Target Asset Allocation | 35.00% |  |
Permitted Range - Minimum | 30.00% |  |
Permitted Range - Maximum | 40.00% |  |
Other Assets | Supplemental defined contribution executive retirement plans [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Pension and Other Postretirement Benefit Contributions, Fair Value | $ 3.4 | $ 3.4 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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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 Target allocation maximum percentage 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 Target allocation minimum percentage 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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