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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 28, 2018	Nov. 30, 2017	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017	Aug. 31, 2017
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Foreign currency forward contracts outstanding	$ 17,900,000			$ 17,900,000
Foreign currency forward contracts, Maturity date				Jul. 01, 2018
Realized foreign currency transactions	0		$ 0	$ 400,000	$ 0
Unrealized net losses				284,000	1,153,000	$ 600,000
Excess tax benefits	3,398,000		$ 6,046,000	7,324,000	$ 10,684,000
Foreign Currency Forward Contracts [Member]
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Unrealized net losses				0
Level 2 [Member]
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Assets, Recurring	0			0
Liabilities, Recurring	0			0
Assets, Nonrecurring	0			0
Liabilities, Nonrecurring	0			0
Accounting Standards Update 2016-09 [Member]
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Excess tax benefits	$ 200,000	$ 600,000		800,000
Excess tax benefits, Operating activities				900,000
Excess tax benefits, Financing activities				900,000
Payments related to tax withholding for share-based compensation, Operating activities				1,700,000
Payments related to tax withholding for share-based compensation, Financing activities				1,700,000
Accounting Standards Update 2016-09 [Member] | Scenario, Previously Reported [Member]
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Excess tax benefits		$ 800,000		$ 800,000

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