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Stock-based Compensation (Schedule of Stock Options Activity) (Details) - USD ($)
$ / shares in Units, $ 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]      
Income tax benefit (expense) from stock-based award $ 1,539 $ 2,064 $ 1,208
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, Number of Shares 27,820    
Granted, Number of Shares    
Exercised, Number of Shares (21,860)    
Forfeited or expired, Number of Shares    
Outstanding, Number of Shares 5,960 27,820  
Exercisable, Number of Shares 5,960    
Outstanding, Weighted-Average Exercise Price Per Share $ 35.59    
Granted, Weighted-Average Exercise Price Per Share    
Exercised, Weighted-Average Exercise Price Per Share 35.47    
Forfeited or expired, Weighted-Average Exercise Price Per Share    
Outstanding, Weighted-Average Exercise Price Per Share 36.03 $ 35.59  
Exercisable, Weighted-Average Exercise Price Per Share $ 36.03    
Outstanding, Weighted-Average Remaining Contractual Term Per Share 1 month 6 days    
Exercisable, Weighted-Average Remaining Contractual Term Per Share 1 month 6 days    
Outstanding, Aggregate Intrinsic Value $ 435    
Exercisable, Aggregate Intrinsic Value 435    
Total intrinsic value of stock options exercised 1,600 $ 2,500 3,300
Income tax benefit (expense) from stock-based award $ 400 $ 700 $ 1,100