Income Taxes - Narrative (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013
Income Tax Disclosure [Line Items]
(Benefit from) provision for income taxes	$ 42,000	$ (253,000)
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
Valuation allowance	(489,030,000)		(487,300,000)
Deferred Tax Assets, Gross	548,620,000
Deferred Tax Liabilities, Net	(54,257,000)
Deferred Tax Assets, Net of Valuation Allowance	494,363,000
Deferred Tax Assets, Net	5,333,000
Maximum
Income Tax Disclosure [Line Items]
Limit on operating loss carryforwards and recognition	405,900,000
Limit on operating loss carryforwards and recognition, tax-effected	443,400,000
Certain Components Likely To Be Subject To Annual Limitation [Member]
Income Tax Disclosure [Line Items]
Deferred Tax Assets, Gross	88,437,000
Certain Components Likely To Be Subject To Annual Limitation [Member] | Maximum
Income Tax Disclosure [Line Items]
Deferred Tax Assets, Net	88,400,000
Certain Components Likely To Be Subject To Annual Limitation [Member] | Minimum [Member]
Income Tax Disclosure [Line Items]
Deferred Tax Assets, Net	50,900,000
Subject To Annual Limitation [Member]
Income Tax Disclosure [Line Items]
Deferred Tax Assets, Gross	98,232,000
Generally Not Subject to Annual Limitation [Member]
Income Tax Disclosure [Line Items]
Deferred Tax Assets, Gross	$ 361,951,000