Debt (Tables)

12 Months Ended

Sep. 30, 2012

Debt Instruments [Abstract]

Schedule Of Long-Term Debt Instruments

The following table shows the balances associated with liability components of the Notes:

	September 30,
	2012			2011
Principal amount	$	287,500		$	287,500
Less: note discount	(32,333		)	(43,213		)
Less: note issuance costs	(3,560		)	(4,826		)
Senior convertible notes, net	$	251,607		$	239,461

Schedule Of Note Related Interest Expense

The following table presents the interest expense recognized related to the Notes for the years ended September 30, 2012, 2011, and 2010:

	Year Ended September 30,
	2012			2011			2010
Contractual interest expense	$	7,188		$	7,188		$	3,494
Amortization of debt issuance costs	1,266			1,212			570
Accretion of debt discount	10,880			10,121			4,662
	$	19,334		$	18,521		$	8,726
Effective interest rate of the liability component	7.73		%	7.73		%	7.73		%