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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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