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Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Exercisable (Details) (SSARs and Stock Options, USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options / SSARs outstanding (shares) | 650,233 |  |  |
Stock options / SSARs outstanding - weighted average contractual remaining life | 2 years 10 months 17 days |  |  |
Stock options / SSARs outstanding - weighted average exercise price ($ per share) | $ 18.12 | $ 33.01 | $ 48.80 | $ 48.85
Stock options / SSARs exercisable (shares) | 355,703 |  |  |
Stock options / SSARs exercisable - weightedaverage contyractual remaining life | 3 years 0 months 7 days |  |  |
Stock options / SSARs exercisable - weighted average exercise price ($ per share) | $ 19.74 | $ 48.73 | $ 58.61 |
$1 - $15 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options / SSARs - exercise price range, lower limit | $ 1 |  |  |
Stock options / SSARs - exercise price range, upper limit | $ 15 |  |  |
Stock options / SSARs outstanding (shares) | 255,747 |  |  |
Stock options / SSARs outstanding - weighted average contractual remaining life | 5 years 8 months 16 days |  |  |
Stock options / SSARs outstanding - weighted average exercise price ($ per share) | $ 12.28 |  |  |
Stock options / SSARs exercisable (shares) | 120,644 |  |  |
Stock options / SSARs exercisable - weightedaverage contyractual remaining life | 5 years 6 months 15 days |  |  |
Stock options / SSARs exercisable - weighted average exercise price ($ per share) | $ 11.85 |  |  |
$15 - $20 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options / SSARs - exercise price range, lower limit | $ 16 |  |  |
Stock options / SSARs - exercise price range, upper limit | $ 20 |  |  |
Stock options / SSARs outstanding (shares) | 250,826 |  |  |
Stock options / SSARs outstanding - weighted average contractual remaining life | 5 years 2 months 23 days |  |  |
Stock options / SSARs outstanding - weighted average exercise price ($ per share) | $ 19.30 |  |  |
Stock options / SSARs exercisable (shares) | 92,224 |  |  |
Stock options / SSARs exercisable - weightedaverage contyractual remaining life | 1 year 11 months 27 days |  |  |
Stock options / SSARs exercisable - weighted average exercise price ($ per share) | $ 19.61 |  |  |
$21 - $75 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options / SSARs - exercise price range, lower limit | $ 21 |  |  |
Stock options / SSARs - exercise price range, upper limit | $ 75 |  |  |
Stock options / SSARs outstanding (shares) | 143,660 |  |  |
Stock options / SSARs outstanding - weighted average contractual remaining life | 2 years 10 months 6 days |  |  |
Stock options / SSARs outstanding - weighted average exercise price ($ per share) | $ 26.48 |  |  |
Stock options / SSARs exercisable (shares) | 142,835 |  |  |
Stock options / SSARs exercisable - weightedaverage contyractual remaining life | 2 years 9 months 29 days |  |  |
Stock options / SSARs exercisable - weighted average exercise price ($ per share) | $ 26.44 |  |  |
$1 - $75 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options / SSARs - exercise price range, lower limit | $ 1 |  |  |
Stock options / SSARs - exercise price range, upper limit | $ 75 |  |  |

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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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