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Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Exercisable (Details) (USD $) In Millions, except Share data, unless otherwise specified |  |  |  |  | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 SSARs and Stock Options | Sep. 30, 2012 SSARs and Stock Options | Sep. 30, 2011 SSARs and Stock Options | Sep. 30, 2010 SSARs and Stock Options | Sep. 30, 2013 $1 - $20 SSARs and Stock Options | Sep. 30, 2013 $21 - $75 SSARs and Stock Options | Sep. 30, 2013 $76 - $150 SSARs and Stock Options | Sep. 30, 2013 $151 - $220 SSARs and Stock Options | Sep. 30, 2013 $1 - $220 SSARs and Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ 0.3 |  |  |  |  |  |  |  |  |
Stock options / SSARs - exercise price range, lower limit |  |  |  |  |  | $ 1 | $ 21 | $ 76 | $ 151 | $ 1
Stock options / SSARs - exercise price range, upper limit |  |  |  |  |  | $ 20 | $ 75 | $ 150 | $ 220 | $ 220
Stock options / SSARs outstanding (shares) |  |  |  |  |  | 357,297 | 148,271 | 0 | 55,216 | 560,784
Stock options / SSARs outstanding - weighted average contractual remaining life |  |  |  |  |  | 5 years 8 months 28 days | 3 years 10 months 6 days | 0 days | 6 months 26 days | 4 years 8 months 23 days
Stock options / SSARs outstanding - weighted average exercise price ($ per share) |  | $ 33.01 | $ 40.80 | $ 48.85 | $ 113.45 | $ 14.26 | $ 26.47 | $ 0 | $ 171.87 | $ 33.01
Stock options / SSARs exercisable (shares) |  |  |  |  |  | 127,739 | 127,165 | 0 | 55,216 | 310,120
Stock options / SSARs exercisable - weightedaverage contyractual remaining life |  |  |  |  |  | 3 years 9 months 26 days | 3 years 9 months 7 days | 0 days | 6 months 26 days | 3 years 2 months 19 days
Stock options / SSARs exercisable - weighted average exercise price ($ per share) |  | $ 48.73 | $ 58.61 | $ 64.65 |  | $ 17.18 | $ 26.95 | $ 0 | $ 171.87 | $ 48.73

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of SSARs and options outstanding and currently exercisable under the plan. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Weighted Average Exercise Price + References No definition available. + Details
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- Definition Share Based Compensation Arrangements By Share Based Payment Award, SSARs And Options, Exercisable, Number + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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