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Basis Of Presentation And Summary Of Significant Accounting Policies (Recently Adopted Accounting Standards) (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits	$ 9,963	$ 21,692	$ 20,161
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefits	$ 700
Excess tax benefits, Operating activities		1,500	2,100
Excess tax benefits, Financing activities		1,500	2,100
Payments related to tax withholding for share-based compensation, Operating activities		1,700	2,600
Payments related to tax withholding for share-based compensation, Financing activities		$ 1,700	$ 2,600

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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-Section 55
-Paragraph 24
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-SubTopic 10
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