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Stock-Based Compensation Plans (Total Cost Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 3,658 $ 3,121 $ 2,536
Performance Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 2,902 2,492 1,890
Unvested Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 500 450 400
Fully-Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 135 60 125
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 121 $ 119 $ 121