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Stock-based Compensation (Details 2) (Performance Share Units [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Performance Share Units [Member]
     
Summary of Performance Share Unit Activity      
Outstanding at August 31, 2011, Number of Shares 48,000    
Granted, Number of Shares 17,180    
Converted to common shares (12,840)    
Forfeited, Number of Shares (11,160)    
Outstanding at August 31, 2012, Number of Shares 41,180 48,000  
Expected to vest at August 31, 2012 28,700    
Outstanding at August 31, 2011, Weighted-Average Grant Date Fair Value per Share $ 34.48    
Granted, Weighted-Average Grant Date Fair Value per Share $ 39.61 $ 36.88 $ 32.08
Converted to common shares, Weighted-Average Grant Date Fair Value per Share $ 32.08    
Forfeited, Weighted-Average Grant Date Fair Value per Share $ 32.08    
Outstanding at August 31, 2012, Weighted-Average Grant Date Fair Value per Share $ 38.02 $ 34.48  
Expected to vest at August 31, 2012, Weighted-Average Grant Date Fair Value per Share $ 38.51    
Outstanding at August 31, 2012, Aggregate Intrinsic Value $ 2,010    
Expected to vest at August 31, 2012, Aggregate Intrinsic Value $ 1,401