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Commitments And Contingencies (Summary Of Undiscounted Environmental Remediation Liability Classifications) (Details) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | Aug. 31, 2012
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Commitments And Contingencies [Abstract] |  |
Other current liabilities | $ 1,740 | $ 2,414
Other noncurrent liabilities | 5,200 | 5,200
Total environmental remediation liabilities | $ 6,940 | $ 7,614

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