Income Taxes - Narrative (Details) (USD $)	Mar. 31, 2014	Sep. 30, 2013
Income Tax Disclosure [Line Items]
Accrued interest and penalties	$ 2,700,000	$ 2,600,000
Limit on operating loss carryforwards and recognition	11,400,000
Limit on operating loss carryforwards and recognition, tax-effected	4,000,000
Total deferred tax assets	551,520,000
Deferred tax liabilities	(54,257,000)
Net deferred tax assets before valuation allowance	497,263,000
Valuation allowance	(491,856,000)	(487,300,000)
Net deferred tax assets	5,407,000
Maximum
Income Tax Disclosure [Line Items]
Limit on operating loss carryforwards and recognition	408,800,000
Limit on operating loss carryforwards and recognition, tax-effected	444,800,000
Certain Components Likely To Be Subject To Annual Limitation [Member]
Income Tax Disclosure [Line Items]
Total deferred tax assets	88,455,000
Certain Components Likely To Be Subject To Annual Limitation [Member] | Maximum
Income Tax Disclosure [Line Items]
Net deferred tax assets	88,500,000
Certain Components Likely To Be Subject To Annual Limitation [Member] | Minimum
Income Tax Disclosure [Line Items]
Net deferred tax assets	52,500,000
Subject To Annual Limitation [Member]
Income Tax Disclosure [Line Items]
Total deferred tax assets	98,232,000
Generally Not Subject to Annual Limitation [Member]
Income Tax Disclosure [Line Items]
Total deferred tax assets	$ 364,833,000