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Stock-Based Compensation (Total Cost Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 27, 2016
Feb. 28, 2017
Feb. 27, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 1,564 $ 1,111 $ 2,777 $ 1,874
Performance Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 1,391 966 2,469 1,591
Unvested Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 125 113 237 225
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 33 $ 32 56 $ 58
Fully-Vested Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 15   $ 15