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Share-Based Compensation (Details)	12 Months Ended
Share-Based Compensation (Details)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Black Scholes Pricing Model [Member]
Share-Based Compensation
Average risk-free interest rate	1.06%	1.94%	2.15%
Expected dividend yield	2.29%	2.37%	3.16%
Expected volatility	43.00%	39.00%	41.00%
Expected term (years)	5 years 4 months	5 years 6 months	5 years 6 months
Monte Carlo Simulation [Member]
Share-Based Compensation
Average risk-free interest rate	0.39%	0.63%	1.22%
Expected dividend yield	2.29%	2.01%	2.51%
Expected volatility	43.00%	49.00%	48.00%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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