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Income Taxes - Narrative (Details) (USD $) | Jun. 30, 2014 | Sep. 30, 2013
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Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 543,385,000 |
Deferred tax liabilities | (54,257,000) |
Net deferred tax assets before valuation allowance | 489,128,000 |
Valuation allowance | 483,648,000 | 487,300,000
Net deferred tax assets | 5,480,000 |
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority | 26,000,000 |
Accrued interest and penalties | 2,800,000 | 2,600,000
Limit on operating loss carryforwards and recognition | 11,400,000 |
Limit on operating loss carryforwards and recognition, tax-effected | 4,000,000 |
Maximum |  |
Income Tax Disclosure [Line Items] |  |
Limit on operating loss carryforwards and recognition | 440,500,000 |
Limit on operating loss carryforwards and recognition, tax-effected | 479,000,000 |
Certain Components Likely To Be Subject To Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 69,779,000 |
Certain Components Likely To Be Subject To Annual Limitation [Member] | Maximum |  |
Income Tax Disclosure [Line Items] |  |
Net deferred tax assets | 48,600,000 |
Certain Components Likely To Be Subject To Annual Limitation [Member] | Minimum |  |
Income Tax Disclosure [Line Items] |  |
Net deferred tax assets | 10,200,000 |
Subject To Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 102,207,000 |
Generally Not Subject to Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 371,399,000 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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