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Stock-Based Compensation Plans (Total Cost Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 4,789 $ 2,846 $ 3,658
Performance Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 3,853 2,034 2,902
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 700 642 500
Fully Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 60 15 135
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 176 $ 155 $ 121