Income Taxes - Narrative (Details) (USD $)	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Income Tax Disclosure [Line Items]
(Benefit from) provisions for income taxes	$ (253,000)	$ (35,747,000)
Accrued interest and penalties	2,500,000		2,500,000
Valuation allowance	495,800,000
Maximum
Income Tax Disclosure [Line Items]
Limit on operating loss carryforwards and recognition	11,400,000
Limit on operating loss carryforwards and recognition, tax-effected	$ 4,000,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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- Definition

This element represents the total of accruals as of the date of the statement of financial position for interest recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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