Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Current:
Federal	$ 15,597	$ 30,352	$ 20,137
State	2,949	3,921	3,791
Current	18,546	34,273	23,928
Deferred:
Federal	(16,460)	(2,378)	4,372
State	648	(91)	137
Deferred	(15,812)	(2,469)	4,509
Provision for income taxes	$ 2,734	$ 31,804	$ 28,437