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Share-Based Compensation (Tables)
6 Months Ended
Mar. 31, 2012
Share-Based Compensation [Abstract]  
Assumptions for estimation of the fair values of stock appreciation rights granted during the reporting periods
                 
    2012     2011  

Risk-free interest rate

    1.67     2.40

Expected volatility

    22.00     24.00

Expected dividend yield

    2.50     2.14

Expected life

    7.9 years       7.8 years  

Fair value derived

  $ 12.61     $ 16.80