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Stock-based Compensation (Stock Options) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit (expense) from stock-based award $ 2,064 $ 1,208 $ 839
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, Number of Shares 62,620    
Granted, Number of Shares    
Exercised, Number of Shares (34,800)    
Forfeited or expired, Number of Shares    
Outstanding, Number of Shares 27,820 62,620  
Exercisable, Number of Shares 27,820    
Outstanding, Weighted-Average Exercise Price Per Share $ 34.97    
Granted, Weighted-Average Exercise Price Per Share    
Exercised, Weighted-Average Exercise Price Per Share 34.48    
Forfeited or expired, Weighted-Average Exercise Price Per Share    
Outstanding, Weighted-Average Exercise Price Per Share 35.59 $ 34.97  
Exercisable, Weighted-Average Exercise Price Per Share $ 35.59    
Outstanding, Weighted-Average Remaining Contractual Term Per Share 1 year    
Exercisable, Weighted-Average Remaining Contractual Term Per Share 1 year    
Outstanding, Aggregate Intrinsic Value $ 2,302    
Exercisable, Aggregate Intrinsic Value 2,302    
Total intrinsic value of stock options exercised 2,500 $ 3,300 1,400
Income tax benefit (expense) from stock-based award $ 700 $ 1,100 $ 400