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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Aug. 31, 2017
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Foreign currency forward contracts outstanding	$ 13,700,000
Foreign currency forward contracts, Maturity date	Jan. 01, 2018
Realized foreign currency transactions	$ 300,000	$ (400,000)
Unrealized net losses	150,000	1,075,000	$ 600,000
Excess tax benefits	3,926,000	4,638,000
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
Liabilities, Recurring	0
Assets, Nonrecurring	0
Liabilities, Nonrecurring	0
Accounting Standards Update 2016-09 [Member]
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Excess tax benefits	$ 800,000
Excess tax benefits, Operating activities		400,000
Excess tax benefits, Financing activities		400,000
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

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-Publisher SEC
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