Stockholders’ Equity (Deficit) (Summary Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Aug. 31, 2017 USD ($) $ / shares shares
Options
Options, Outstanding at September 1, 2016 | shares	2,334
Options, Granted | shares	670
Options, Exercised | shares	(292)
Options, Forfeited or expired | shares	(176)
Options, Outstanding at August 31, 2017 | shares	2,536
Options, Exercisable at August 31, 2017 | shares	1,632
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding at September 1, 2016 | $ / shares	$ 18.37
Weighted Average Exercise Price, Granted | $ / shares	25.26
Weighted Average Exercise Price, Exercised | $ / shares	10.74
Weighted Average Exercise Price, Forfeited or expired | $ / shares	27.74
Weighted Average Exercise Price, Outstanding at August 31, 2017 | $ / shares	20.42
Weighted Average Exercise Price, Exercisable at August 31, 2017 | $ / shares	$ 16.88
Weighted Average Remaining Contractual Life, Outstanding at August 31, 2017	3 years 11 months 1 day
Weighted Average Remaining Contractual Life, Exercisable at August 31, 2017	2 years 9 months 6 days
Aggregate Intrinsic Value, Outstanding at August 31, 2017 | $	$ 13,501
Aggregate Intrinsic Value, Exercisable at August 31, 2017 | $	$ 13,501