Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Income Taxes [Abstract]
Federal, Current	$ 20,137	$ 14,597	$ 16,580
State, Current	3,791	3,576	3,490
Current	23,928	18,173	20,070
Federal, Deferred	4,372	10,592	5,328
State, Deferred	137	(1,528)	450
Deferred	4,509	9,064	5,778
Provision for income taxes	$ 28,437	$ 27,237	$ 25,848