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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Allocated Share-based Compensation Expense $ 1.0 $ 1.0 $ 2.9 $ 2.8