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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2018	May 31, 2017	Aug. 31, 2017
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Foreign currency forward contracts outstanding	$ 19,000,000		$ 19,000,000
Foreign currency forward contracts, Maturity date			Jun. 01, 2018
Realized foreign currency transactions	0	$ 0	$ 400,000	$ 0
Unrealized net losses			(200,000)	872,000	$ 600,000
Excess tax benefits	5,167,000	$ 5,842,000	12,491,000	16,526,000
Carrying value of senior notes	82,800,000		82,800,000		$ 134,000,000
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
Senior Notes [Member]
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Fair value of senior notes	18,600,000		18,600,000
Carrying value of senior notes	$ 19,600,000		19,600,000
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				1,400,000
Excess tax benefits, Financing activities				1,400,000
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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