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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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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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