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Commitments And Contingencies (Details) (USD $)	3 Months Ended
Commitments And Contingencies (Details) (USD $)	Nov. 30, 2011	Nov. 30, 2013	Aug. 31, 2013	Nov. 30, 2012
Commitments And Contingencies [Abstract]
Environmental remediation expense	$ 7,200,000
Other current liabilities		1,516,000	1,740,000	2,391,000
Other noncurrent liabilities		5,200,000	5,200,000	5,200,000
Total environmental remediation liabilities		$ 6,716,000	$ 6,940,000	$ 7,591,000

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.

+ References+ Details

- Definition

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

+ References+ Details