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Income Taxes - Classification of Deferred Tax Assets (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
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