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Income Taxes - Classification of Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 546,773 | $ 551,082
Deferred tax liabilities | (54,257) | (56,017)
Net deferred tax assets before valuation allowance | 492,516 | 495,065
Valuation allowance | (487,263) | (488,217)
Deferred Tax Assets, Net | 5,253 | 6,848
Subject To Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 94,258 |
Generally Not Subject to Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 364,137 |
Certain Components Likely To Be Subject To Annual Limitation [Member] |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 88,378 |

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