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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Allocated Share-based Compensation Expense $ 0.9 $ 0.9 $ 1.9 $ 1.8