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Basis Of Presentation And Summary Of Significant Accounting Policies (Foreign Currency) (Narrative) (Details) - USD ($) | 12 Months Ended
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Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Foreign Currency Transactions [Line Items] |  |  |
Foreign currency transactions gain (loss), before tax | $ 400,000 | $ 2,400,000 | $ (1,700,000)
Foreign currency forward contracts outstanding | 23,400,000 |  |
Unrealized net losses | 364,000 | (986,000) | $ 2,086,000
Foreign Currency Forward Contracts [Member] |  |  |
Foreign Currency Transactions [Line Items] |  |  |
Unrealized net losses | 600,000 | 0 |
Realized net losses | $ 500,000 | $ 0 |

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