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Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |
--- | --- | --- | ---
May 31, 2012 | May 31, 2013 | Aug. 31, 2012
Commitments And Contingencies [Abstract] |  |  |
Environmental remediation expense | $ 7,225 |  |
Total environmental remediation liabilities | 7,759 | 7,250 | 7,614
Other current liabilities | 2,559 | 2,050 | 2,414
Other noncurrent liabilities | $ 5,200 | $ 5,200 | $ 5,200

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