Income Taxes (Provision For Income Taxes Computed By Applying The Statutory Federal Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Income Taxes [Abstract]
Amount computed by applying a tax rate of 35%	$ 32,103	$ 25,818	$ 19,705
State income taxes (net of federal income tax benefit)	1,330	2,562	1,572
Employment related and other tax credits, net	(2,096)	(1,537)	(1,572)
Federal tax benefit of statutory tax deduction	(4,093)
Other	(7)	(995)	(107)
Provision for income taxes	$ 27,237	$ 25,848	$ 19,598
Statutory federal income tax rate	35.00%