Income Taxes (Provision For Income Taxes Computed By Applying The Statutory Federal Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Aug. 31, 2012
Income Taxes [Abstract]
Amount computed by applying a tax rate of 35%	$ 25,818	$ 19,705	$ 20,287
State income taxes (net of federal income tax benefit)	2,562	1,572	1,900
Employment related and other tax credits, net	(1,537)	(1,572)	(1,291)
Adjustment of prior year deferred tax items			1,559
Other	(995)	(107)	(578)
Provision for income taxes	$ 25,848	$ 19,598	$ 21,877
Statutory federal income tax rate	35.00%