Income Taxes (Summary Of Tax Credit Carryforwards) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2014
Tax Credit Carryforward [Line Items]
Credits Generated	$ 17,661
Credits Used in Prior Years	(6,969)
Credits Used in Fiscal 2014	(2,667)
Credits Carried Forward	8,025
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 Prior Years	(1,071)
2008 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2008
Credit Expires	Aug. 31, 2018
Credits Generated	1,444
Credits Used in Fiscal 2014	(1,254)
Credits Carried Forward	190
2009 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2009
Credit Expires	Aug. 31, 2019
Credits Generated	2,006
Credits Carried Forward	2,006
2010 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2010
Credit Expires	Aug. 31, 2020
Credits Generated	2,907
Credits Carried Forward	2,907
2011 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2011
Credit Expires	Aug. 31, 2021
Credits Generated	3,448
Credits Used in Prior Years	(526)
Credits Carried Forward	2,922
2012 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2012
Credit Expires	Aug. 31, 2022
Credits Generated	2,564
Credits Used in Prior Years	(2,564)
2013 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2013
Credit Expires	Aug. 31, 2023
Credits Generated	2,808
Credits Used in Prior Years	(2,808)
2014 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2014
Credit Expires	Aug. 31, 2024
Credits Generated	1,413
Credits Used in Fiscal 2014	$ (1,413)