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Retirement Plan and Incentive Awards - Schedule of Stock Options and SSARs Outstanding and Related Activity (Details) (SSARs and Stock Options, USD $) | 12 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
SSARs and Stock Options |  |  |
Shares [Roll Forward] |  |  |
Outstanding at beginning of period | 375,248 | 515,671 | 421,783
Granted | 109,507 | 150,853 | 201,229
Expired | (10,948) | (148,393) | (6,396)
Canceled/exchanged | 0 | 0 | (93,187)
Forfeited | (43,834) | (142,883) | (7,758)
Outstanding at end of period | 429,973 | 375,248 | 515,671
Exercisable at end of period | 247,588 | 163,076 | 154,132
Vested or expected to vest in the future | 428,597 | 367,693 | 460,587
Weighted-Average Exercise Price [Roll Forward] |  |  |
Outstanding at beginning of period | $ 48.85 | $ 113.45 | $ 165.35
Granted | $ 10.80 | $ 23.45 | $ 28.45
Expired | $ 82.51 | $ 270.10 | $ 137.55
Canceled/exchanged |  | $ 0.00 | $ 165.20
Forfeited | $ 24.13 | $ 25.45 | $ 90.80
Outstanding at end of period | $ 40.80 | $ 48.85 | $ 113.45
Exercisable at end of period | $ 58.61 | $ 64.65 | $ 207.95
Vested or expected to vest in the future | $ 40.88 | $ 49.30 | $ 102.75

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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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- Definition Share Based Compensation Arrangement By Share Based Payment Award, SSARs And Options,Exercisable Number + References No definition available. + Details
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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest SSARs and stock options outstanding can be converted under the plan. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -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. + Details
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