Stockholders' Equity (Deficit) (Summary Of Dividends Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Nov. 30, 2017	Aug. 31, 2017	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Equity [Abstract]
Dividend per share (usd per share)	$ 0.16	$ 0.16	$ 0.16	$ 0.16	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Total amount	$ 5,746	$ 5,879	$ 6,103	$ 6,243	$ 5,588	$ 6,041	$ 6,100	$ 6,359	$ 23,971	$ 24,088	$ 21,340