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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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