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Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 0.9 $ 0.6 $ 1.8 $ 1.5
2015 Long-Term Incentive Plan [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant-date fair value $ 74.47      
Number of shares granted 7,427      
Fully vested scheduled date Nov. 01, 2017