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Income Taxes - Classification of Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Sep. 30, 2011
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Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 551,082 | $ 536,097
Deferred tax liabilities | (56,017) | (54,052)
Net deferred tax assets before valuation allowance | 495,065 | 482,045
Valuation allowance | (488,217) | (479,285)
Net deferred tax assets | 6,848 | 2,760
Subject To Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 87,441 |
Generally Not Subject to Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 345,839 |
Certain Components Likely To Be Subject To Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 117,802 |

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- Definition Amount before allocation of valuation allowances of deferred tax liability to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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