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Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 29, 2012	Feb. 28, 2013	Aug. 31, 2012
Commitments And Contingencies [Abstract]
Environmental remediation expense	$ 7,225
Total environmental remediation liabilities	7,937	7,444	7,614
Other current liabilities	2,737	2,244	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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