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Commitments And Contingencies (Summary Of Undiscounted Environmental Remediation Liability Classifications) (Details) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | Aug. 31, 2011
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Commitments And Contingencies [Abstract] |  |
Other current liabilities | $ 2,414 | $ 1,540
Other noncurrent liabilities | 5,200 |
Total environmental remediation liabilities | $ 7,614 | $ 1,540

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