Commitments And Contingencies (Summary Of Undiscounted Environmental Remediation Liability Classifications) (Details) - USD ($) $ in Thousands	May 31, 2016	Aug. 31, 2015	May 31, 2015
Commitments And Contingencies [Abstract]
Other current liabilities	$ 980	$ 1,431	$ 1,119
Other noncurrent liabilities	18,571	6,100	6,475
Total environmental remediation liabilities	$ 19,551	$ 7,531	$ 7,594