Income Taxes (Summary Of Tax Credit Carryforwards) (Details) $ in Thousands	12 Months Ended
Aug. 31, 2018 USD ($)
Tax Credit Carryforward [Line Items]
Credits Generated	$ 16,723
Credits Used in Prior Years	(10,161)
Credits Used in Fiscal 2017
Credits Carried Forward	$ 6,562
2011 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2011
Credit Expires	Aug. 31, 2021
Credits Generated	$ 3,445
Credits Used in Prior Years	(414)
Credits Used in Fiscal 2017
Credits Carried Forward	$ 3,031
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 2017
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 2017
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 2017
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	$ 1,422
Credits Used in Prior Years	(1,422)
Credits Used in Fiscal 2017
Credits Carried Forward
2016 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2016
Credit Expires	Aug. 31, 2026
Credits Generated	$ 1,569
Credits Used in Prior Years	(1,569)
Credits Used in Fiscal 2017
Credits Carried Forward
2017 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2017
Credit Expires	Aug. 31, 2027
Credits Generated	$ 1,804
Credits Used in Fiscal 2017
Credits Carried Forward	$ 1,804
2018 [Member]
Tax Credit Carryforward [Line Items]
Credit Generated in Fiscal Year Ended	Aug. 31, 2018
Credit Expires	Aug. 31, 2028
Credits Generated	$ 1,727
Credits Used in Fiscal 2017
Credits Carried Forward	$ 1,727

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Tax Credit Carryforward, Used in Current Fiscal Year

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Tax Credit Carryforward, Used in Prior Years

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

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Amount of valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from tax credit carryforwards for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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