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Fair Value Measurements (Schedule Of Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2013
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | $ 101,246 | $ 139,093 | $ 171,842 | $ 151,927
Derivative assets | 73 | 712 |  |
Derivative liabilities | (595) | (413) |  |
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | 101,246 | 139,093 |  |
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets | 73 | 712 |  |
Derivative liabilities | (595) | (413) |  |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents |  |  |  |
Derivative assets |  |  |  |
Derivative liabilities |  |  |  |

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