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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Share-based compensation expense $ 0.6 $ 1.0 $ 1.5 $ 2.1
RSUs [Member]        
Weighted average grant date fair value of restricted stock $ 63.73   $ 63.73  
Total units of restricted stock granted 7,588