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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
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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Undiscounted amount of the accrual for environmental loss contingencies.

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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