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Stock-Based Compensation Plans (Total Cost Of Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 8,617 $ (573) $ 4,789
Performance-Based Award [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 7,652 (1,518) 3,853
Restricted Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 700 700 700
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 205 185 176
Fully-Vested Share Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 60 $ 60 $ 60