Debt (Schedule Of Note Related Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Debt Instruments [Abstract]
Interest Expense, Debt, Excluding Amortization	$ 7,188	$ 7,188	$ 3,494
Amortization of debt issuance costs	1,266	1,212	570
Amortization of debt discount	10,880	10,121	4,662
Interest Expense, Debt	$ 19,334	$ 18,521	$ 8,726
Effective interest rate of the liability component	7.73%	7.73%	7.73%