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Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2012	Aug. 31, 2012
Commitments And Contingencies [Abstract]
Environmental remediation expense	$ 7,225
Total environmental remediation liabilities	8,099	7,591	7,614
Other current liabilities	2,899	2,391	2,414
Other noncurrent liabilities	$ 5,200	$ 5,200	$ 5,200

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Undiscounted amount of the accrual for environmental loss contingencies.

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