Stockholders' Equity (Deficit) (Summary Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Aug. 31, 2018 USD ($) $ / shares shares
Options
Outstanding at September 1, 2017 | shares	2,536
Granted | shares	713
Exercised | shares	(1,055)
Forfeited or expired | shares	(101)
Outstanding at August 31, 2018 | shares	2,093
Exercisable at August 31, 2018 | shares	968
Weighted Average Exercise Price
Outstanding at September 1, 2017 | $ / shares	$ 20.42
Granted | $ / shares	25.84
Exercised | $ / shares	15.59
Forfeited or expired | $ / shares	27.93
Outstanding at August 31, 2018 | $ / shares	24.34
Exercisable at August 31, 2018 | $ / shares	$ 22.42
Weighted Average Remaining Contractual Life, Outstanding at August 31, 2018	4 years 8 months 5 days
Weighted Average Remaining Contractual Life, Exercisable at August 31, 2018	3 years 2 months 5 days
Aggregate Intrinsic Value, Outstanding at August 31, 2018 | $	$ 24,117
Aggregate Intrinsic Value, Exercisable at August 31, 2018 | $	$ 13,013