Income Taxes (Summary Of Tax Credit Carryforwards) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013
Tax Credit Carryforward [Line Items]
Credits Generated	$ 13,023
Credits Used in Prior Years	(907)
Credits Used in Fiscal 2013	(6,693)
Credits Carried Forward	5,423
2003 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2003
Credit Expires	Aug. 31, 2013
Credits Generated	585
Credits Used in Fiscal 2013	(585)
2004 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2004
Credit Expires	Aug. 31, 2014
Credits Generated	625
Credits Used in Fiscal 2013	(625)
2005 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2005
Credit Expires	Aug. 31, 2015
Credits Generated	877
Credits Used in Fiscal 2013	(877)
2006 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2006
Credit Expires	Aug. 31, 2016
Credits Generated	625
Credits Used in Fiscal 2013	(625)
2007 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2007
Credit Expires	Aug. 31, 2017
Credits Generated	1,071
Credits Used in Fiscal 2013	(917)
Credits Carried Forward	154
2011 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2011
Credit Expires	Aug. 31, 2021
Credits Generated	3,531
Credits Carried Forward	3,531
2012 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2012
Credit Expires	Aug. 31, 2022
Credits Generated	2,645
Credits Used in Prior Years	(907)
Credits Carried Forward	1,738
2013 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2013
Credit Expires	Aug. 31, 2023
Credits Generated	3,064
Credits Used in Fiscal 2013	$ (3,064)