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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2019 | May 31, 2018 | Nov. 30, 2018 | Aug. 31, 2018 | Nov. 30, 2017
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Unrealized foreign currency transactions |  |  | $ 658,000 | $ 200,000 |  |  |
Carrying value of senior notes | $ 61,208,000 |  | 61,208,000 |  |  | $ 62,800,000 |
Cumulative effect of change in accounting principle |  |  |  |  | $ (324,000) |  | $ 61,000
Foreign Currency Forward Contracts [Member] |  |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Foreign currency forward contracts outstanding | 10,300,000 |  | $ 10,300,000 |  |  |  |
Foreign currency forward contracts, Maturity date |  |  | Jun. 30, 2019 |  |  |  |
Realized foreign currency transactions | 400,000 | $ 0 | $ 0 | 400,000 |  |  |
Unrealized foreign currency transactions |  |  | 0 | $ 0 |  |  |
Level 2 [Member] | Recurring [Member] |  |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |  |
Liabilities | 0 |  | 0 |  |  |  |
Level 2 [Member] | Nonrecurring [Member] |  |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Assets | 0 |  | 0 |  |  |  |
Liabilities | 0 |  | 0 |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Fair value of senior notes | 19,000,000.0 |  | 19,000,000.0 |  |  |  |
Carrying value of senior notes | 18,800,000 |  | 18,800,000 |  |  |  |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reclassification from AOCI to retained earnings | 100,000 |  |  |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cumulative effect of change in accounting principle | $ 98,000 |  | $ 98,000 |  | $ (324,000) |  | $ (128,000)

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