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Commitments And Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Aug. 31, 2011
Commitments and Contingencies Disclosure [Abstract]
Environmental Remediation Expense	$ 7,225	$ 713
Total environmental remediation liabilities	8,099	1,339	1,540
Other current liabilities	2,899	1,339	1,540
Other noncurrent liabilities	$ 5,200

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The estimated aggregate undiscounted amount of the accrual for environmental loss contingencies as of the balance sheet date.

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