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Share-Based Compensation (Narrative) (Details)
$ in Thousands
12 Months Ended
Aug. 31, 2021
USD ($)
item
shares
Aug. 31, 2020
USD ($)
shares
Aug. 31, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pre-tax total unrecognized compensation cost related to nonvested share-based compensation | $ $ 5,400    
Weighted average period to be recognized 1 year 9 months 18 days    
Outstanding stock options vested 38,954 25,843 15,496
Shares outstanding 127,211 132,144  
Share withheld for payroll tax obligations | $ $ 1,269 $ 1,111 $ 1,124
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Percentage vested per year 33.00%    
Fair value vested | $ $ 3,700 $ 3,800  
Number of shares vested 44,252    
Restricted Stock Units Settled In Cash [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding 4,656 4,938 4,103
Performance Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Number of shares vested 0 0 0
Performance Stock Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of awards actually earned 0.00%    
Performance Stock Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of awards actually earned 20000.00%    
2015 Long-Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan effective date Jan. 26, 2015    
Maximum number of shares authorized 626,968    
Number of shares available 255,514    
Stock award ratio | item 1    
2015 Long-Term Incentive Plan [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option expire, years 10 years    
Vesting period 4 years    
Non Employee Directors [Member] | Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 9 months