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Share-Based Compensation Plans (Total Cost Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 02, 2013
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   $ 2,536 $ 3,534 $ 3,589
Performance Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   1,890 2,716 2,504
Fully-Vested Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   125 371 112
Unvested Share Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   400 334 383
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost   $ 121 $ 113 92
Management Stock Loans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 500     $ 498