Long-term Debt (Details 4) (USD $)	9 Months Ended			1 Months Ended	9 Months Ended			1 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011	Jun. 30, 2012 8.75% Convertible senior subordinated notes due 2016	Jun. 30, 2012 8.75% Convertible senior subordinated notes due 2016	Sep. 30, 2011 8.75% Convertible senior subordinated notes due 2016	Jun. 30, 2012 8.75% Convertible senior subordinated notes due 2016 Chairman and CEO	Jun. 30, 2012 2.50% Convertible senior subordinated notes due 2014	Dec. 31, 2011 2.50% Convertible senior subordinated notes due 2014	Jun. 30, 2012 2.50% Convertible senior subordinated notes due 2014	Sep. 30, 2011 2.50% Convertible senior subordinated notes due 2014	Jun. 30, 2012 2.50% Convertible senior subordinated notes due 2014 Chairman and CEO	Jun. 30, 2012 14.75% Convertible senior subordinated notes due 2014	Mar. 31, 2012 14.75% Convertible senior subordinated notes due 2014	Sep. 30, 2011 14.75% Convertible senior subordinated notes due 2014	Jun. 30, 2012 16% Convertible senior subordinated notes due 2016	Sep. 30, 2011 16% Convertible senior subordinated notes due 2016
Long-term debt
Interest rate on secured notes (as a percent)				8.75%	8.75%	8.75%		2.50%		2.50%	2.50%		14.75%		14.75%	16.00%	16.00%
Additional borrowings				$ 49,800,000
Cash consideration paid for cancelation of convertible senior subordinated notes								600,000	5,500,000	4,700,000
Repurchase and cancellation of convertible senior subordinated notes								49,800,000	7,500,000	5,000,000			1,000,000	12,000,000
Write-off of unamortized balances of debt discount and debt issue costs								4,500,000	900,000	500,000			200,000	700,000
Debt instrument, extended maturity term					2 years
Convertible senior subordinated notes, net of applicable discounts	103,062,000		127,803,000	49,221,000	49,221,000	0	1,150,000	53,841,000		53,841,000	106,688,000	1,150,000	0		12,101,000	0	9,014,000
Debt instrument prepayment premium													100,000	1,600,000
Payments on long-term debt	(32,931,000)	(342,509,000)
Gain on extinguishment of debt	2,350,000	0							2,000,000	300,000
Long-term debt redeemed																$ 9,200,000