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Share-Based Compensation (Tables)
9 Months Ended
Jun. 30, 2011
Share-Based Compensation [Abstract]  
Assumptions for estimation of the fair values of stock appreciation rights granted during the reporting periods
                 
    2011   2010
Risk-free interest rate
    2.40 %     2.60 %
Expected volatility
    24.00 %     28.00 %
Expected dividend yield
    2.14 %     1.96 %
Expected life
  7.8 years   6.5 years
Fair value derived
  $ 16.80     $ 19.70