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Share-Based Compensation (Total Cost Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 27, 2016
Feb. 28, 2015
Feb. 27, 2016
Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 1,111 $ 608 $ 1,874 $ 1,010
Performance Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 966 476 1,591 775
Unvested Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 113 100 225 175
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 32 $ 32 $ 58 $ 60