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Income Taxes - Classification of Deferred Tax Assets (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Sep. 30, 2013
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Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 491,547 | $ 546,773
Deferred tax liabilities | (43,496) | (54,257)
Net deferred tax assets before valuation allowance | 448,051 | 492,516
Valuation allowance | (445,228) | (487,263)
Deferred tax assets, net | 2,823 | 5,253
Subject to annual limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 102,207 |
Generally not subject to annual limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 348,435 |
Certain components likely to be subject to annual limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 40,905 |

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