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Stock-Based Compensation (Total Cost Of Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 2,370 $ (5,104) $ 5,127 $ (1,460)
Long-Term Incentive Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 2,144 (5,326) 4,458 (2,124)
Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost 175 175 525 525
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation cost $ 51 $ 47 $ 144 $ 139