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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Sep. 30, 2014
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Income Tax Disclosure [Line Items] |  |
Uncertain tax positions reasonably possible to reverse in next twelve months | $ 3,200 |
Accrued interest and penalties | 500 | $ 400
Limit on operating loss carryforwards and recognition | 11,400 |
Limit on operating loss carryforwards and recognition, tax-effected | 4,000 |
Total deferred tax assets | 459,304 |
Deferred tax liabilities | (43,496) |
Net deferred tax assets before valuation allowance | 415,808 |
Valuation allowance | (415,762) | $ (445,200)
Net deferred tax assets | 46 |
Subject To Annual Limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | 93,741 |
Generally Not Subject to Annual Limitation |  |
Income Tax Disclosure [Line Items] |  |
Total deferred tax assets | $ 365,563 |

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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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