Stockholders' Equity (Summary Of Stock Option Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Aug. 31, 2012
Stockholders' Equity [Abstract]
Options, Outstanding at September 1, 2011	7,331
Options, Granted	1,019
Options, Exercised	(31)
Options, Forfeited or expired	(1,061)
Options, Outstanding at August 31, 2012	7,258
Options, Exercisable at August 31, 2012	5,467
Weighted Average Exercise Price, Outstanding at September 1, 2011	$ 13.06
Weighted Average Exercise Price, Granted	$ 6.91
Weighted Average Exercise Price, Exercised	$ 9.14
Weighted Average Exercise Price, Forfeited or expired	$ 11.70
Weighted Average Exercise Price, Outstanding at August 31, 2012	$ 12.41
Weighted Average Exercise Price, Exercisable at August 31, 2012	$ 13.80
Weighted Average Remaining Contractual Life (Yrs.), Outstanding at August 31, 2012	3 years 5 months 16 days
Weighted Average Remaining Contractual Life (Yrs.), Exercisable at August 31, 2012	2 years 8 months 23 days
Aggregate Intrinsic Value, Outstanding at August 31, 2012	$ 3,330
Aggregate Intrinsic Value, Exercisable at August 31, 2012	$ 569