Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 625	$ 3,652
Additions for tax positions of prior years	18	725
Reductions for tax positions of prior years	0	(2,838)
Reductions due to settlement	0	(212)
Reductions due to statute expiration	0	(702)
Balance at end of year	$ 643	$ 625