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, 2013	Aug. 31, 2012	Aug. 31, 2011
Income Taxes [Abstract]
Amount computed by applying a tax rate of 35%	$ 19,705	$ 20,287	$ 9,933
State income taxes (net of federal income tax benefit)	229	928	602
Employment related and other tax credits, net	(1,572)	(1,291)	(1,730)
Adjustment of prior year deferred tax items		1,559
Valuation allowance for state net operating losses	1,343	972	839
Other	(107)	(578)	(490)
Provision for income taxes	$ 19,598	$ 21,877	$ 9,154
Statutory federal income tax rate	35.00%