Income Taxes (Details Textuals 1) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended
	Apr. 02, 2012	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Abstract]
Income Tax Expense (Benefit)		$ 63,300,000	$ 59,100,000	$ 31,100,000	$ 41,600,000	$ (900,000)	$ (715,600,000)	$ 1,700,000	$ 1,500,000	$ 195,100,000	$ (713,400,000)	$ (59,700,000)
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		2,700,000				11,800,000				2,700,000	11,800,000
Valuation allowance		(31,000,000)		(23,200,000)		(41,900,000)				(31,000,000)	(41,900,000)
Prior Period Reclassification Adjustment										23,900,000
Unrecognized Tax Benefits, Portion Related to Deferred Income Taxes		1,500,000				2,300,000				1,500,000	2,300,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	(753,200,000)	(2,900,000)		(18,700,000)		(36,500,000)	(716,700,000)
Income Tax Uncertainties [Abstract]
Interest expense related to unrecognized tax benefits										(2,800,000)	(100,000)	(12,700,000)
Total accrued interest expense related to unrecognized tax benefits		2,200,000				5,100,000				2,200,000	5,100,000
Accrued penalties on income taxes		0				0				0	0
Possible decrease in unrecognized tax benefits		4,200,000								4,200,000
Possible decrease in accrued interest on unrecognized tax benefits		2,200,000								2,200,000
Possible decrease in unrecognized tax benefits and related accrued interest - portion related to income tax expense		4,100,000								4,100,000
Possible decrease in unrecognized tax benefits and related accrued interest - portion related to deferred income taxes		2,300,000								2,300,000
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards						85,200,000					85,200,000
ValuationAllowancePortionExpectedtobeWrittenOff [Member]
Operating Loss Carryforwards [Line Items]
Valuation allowance		$ (13,200,000)								$ (13,200,000)