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Stock-based Compensation (Details Textual) (USD $)
 12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Number of shares authorized for issuance 2,957,830    
Stock-based compensation related to stock-based equity awards $ 2,769,000 $ 3,033,000 $ 2,864,000
Income tax benefits related to stock-based compensation 900,000 1,000,000 900,000
2007 Plan [Member]
      
Common stock available for future issuance 2,052,415    
Stock Options [Member]
      
Total intrinsic value of options exercised 2,800,000 7,200,000 1,300,000
Income tax benefits from stock option exercises 700,000 2,200,000 300,000
Restricted Stock Units [Member]
      
Restricted stock units vesting period 3 years    
Unamortized compensation cost related to non - vested 1,800,000    
Remaining weighted-average vesting periods 1 year 7 months 6 days    
Granted, Weighted-Average Grant Date Fair Value per Share $ 39.71 $ 37.35 $ 32.14
Total intrinsic value of all RSUs/PSUs converted to common shares 3,100,000 1,900,000 900,000
Income tax benefits from RSUs/PSUs converted to common shares 900,000 500,000 300,000
Performance Share Units [Member]
      
Performance measurement period 2 years    
Unamortized compensation cost related to non - vested 300,000    
Remaining weighted-average vesting periods 1 year    
Granted, Weighted-Average Grant Date Fair Value per Share $ 39.61 $ 36.88 $ 32.08
Total intrinsic value of all RSUs/PSUs converted to common shares 600,000    
Income tax benefits from RSUs/PSUs converted to common shares $ 200,000    
Restricted Stock Awards [Member]
      
Age of director that determines forfeiture of options 65    
Maximum [Member] | Performance Share Units [Member]
      
Percent of original target number of vested shares 150.00%    
Minimum [Member] | Performance Share Units [Member]
      
Percent of original target number of vested shares 0.00%