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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2016
Nov. 30, 2014
Feb. 29, 2016
Aug. 31, 2012
Commitments And Contingencies [Abstract]        
Environmental remediation expense $ 13.0 $ 1.5 $ 13.0 $ 7.2
Estimated aggregate accrued cost $ 19.9   $ 19.9