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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2015
May. 31, 2014
Share-Based Compensation [Abstract]        
Share-based compensation expense $ 0.5 $ 1.0 $ 2.6 $ 3.2