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Stock-based Compensation (Performance Share Units) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Income tax benefit (expense) from stock-based award $ 839,000 $ 891,000 $ 709,000
Performance Share Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding, Number of Shares 17,180    
Granted, Number of Shares       
Converted to common shares, Number of Shares (13,872)    
Forfeited, Number of Shares (3,308)    
Outstanding, Number of Shares   17,180  
Outstanding, Weighted-Average Exercise Price $ 39.61    
Granted, Weighted-Average Exercise Price       
Converted to common shares, Weighted-Average Exercise Price $ 39.61   $ 39.61
Forfeited, Weighted-Average Exercise Price $ 39.61    
Outstanding, Weighted-Average Exercise Price   $ 39.61  
Income tax benefit (expense) from stock-based award 300,000 200,000 200,000
Intrinsic value of stock-based awards converted into common shares $ 1,000,000 $ 600,000 $ 600,000