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Commitments And Contingencies (Summary Of Undiscounted Environmental Remediation Liability Classifications) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Feb. 29, 2016	Nov. 30, 2014	Feb. 29, 2016	Aug. 31, 2012	Aug. 31, 2015	Feb. 28, 2015
Commitments And Contingencies [Abstract]
Environmental remediation expense	$ 13,000	$ 1,500	$ 13,000	$ 7,200
Other current liabilities	1,296		1,296		$ 1,431	$ 1,222
Other noncurrent liabilities	18,650		18,650		6,100	6,475
Total environmental remediation liabilities	$ 19,946		$ 19,946		$ 7,531	$ 7,697

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Undiscounted amount of the accrual for environmental loss contingencies.

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