Income Taxes (Summary Of Tax Credit Carryforwards) (Details) $ in Thousands	12 Months Ended
Aug. 31, 2015 USD ($)
Tax Credit Carryforward [Line Items]
Credits Generated	$ 18,000
Credits Used in Prior Years	(9,241)
Credits Used in Fiscal 2015	(3,653)
Credits Carried Forward	$ 5,106
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 Prior Years	$ (1,444)
Credits Used in Fiscal 2015
Credits Carried Forward
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 Used in Prior Years	(1,041)
Credits Used in Fiscal 2015	$ (965)
Credits Carried Forward
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 Used in Fiscal 2015	(1,247)
Credits Carried Forward	$ 1,660
2011 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2011
Credit Expires	Aug. 31, 2021
Credits Generated	$ 3,446
Credits Used in Fiscal 2015
Credits Carried Forward	$ 3,446
2012 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2012
Credit Expires	Aug. 31, 2022
Credits Generated	$ 2,563
Credits Used in Prior Years	$ (2,563)
Credits Used in Fiscal 2015
Credits Carried Forward
2013 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2013
Credit Expires	Aug. 31, 2023
Credits Generated	$ 2,815
Credits Used in Prior Years	$ (2,815)
Credits Used in Fiscal 2015
Credits Carried Forward
2014 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2014
Credit Expires	Aug. 31, 2024
Credits Generated	$ 1,378
Credits Used in Prior Years	$ (1,378)
Credits Used in Fiscal 2015
Credits Carried Forward
2015 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2015
Credit Expires	Aug. 31, 2025
Credits Generated	$ 1,441
Credits Used in Fiscal 2015	$ (1,441)
Credits Carried Forward

Tax Credit Carryforward, Credits Generated

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874

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