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Income Taxes - Narrative (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Income Tax Disclosure [Line Items] |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | $ 14,300,000 |  |  |
Federal net operating loss carryforwards | 266,900,000 |  |  |
State net operating loss carryforwards | 76,700,000 |  |  |
Alternative minimum tax credit | 9,800,000 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business | 3,800,000 |  |  |
Deferred tax asset valuation allowance | 445,228,000 | 487,263,000 |  |
Increase (decrease) in unrecognized tax benefits | (9,900,000) | (15,200,000) |  |
Gross deferred tax assets | 491,547,000 | 546,773,000 |  |
Deferred tax assets, net | 2,823,000 | 5,253,000 |  |
Unrecognized tax benefits | 4,616,000 | 17,464,000 | 19,630,000 | 46,648,000
Accrued interest and penalties | 400,000 | 2,600,000 |  |
Significant (Increase) Decrease in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound | 4,000,000 |  |  |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 26,800,000 |  |  |
IRS interest refund | (1,714,000) | 0 | 0 |
Tax refunds received | 33,271,000 | 6,730,000 | 2,568,000 |
Maximum |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Limit on operating loss carryforwards and recognition | 11,400,000 |  |  |
Limit on operating loss carryforwards and recognition, tax-effected | 4,000,000 |  |  |
Gross deferred tax assets | 40,900,000 |  |  |
Certain components likely to be subject to annual limitation |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Gross deferred tax assets | 40,905,000 |  |  |
Certain components likely to be subject to annual limitation | Maximum |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Deferred tax assets, net | 440,100,000 |  |  |
Certain components likely to be subject to annual limitation | Minimum |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Gross deferred tax assets | 7,900,000 |  |  |
Deferred tax assets, net | 407,100,000 |  |  |
Excise Tax Refund |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax refunds received | $ 300,000 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible general business tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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