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Stock Options (Details) (USD $)	3 Months Ended
Stock Options (Details) (USD $)	Dec. 31, 2012
2010 Options
Adjusted exercise price	$ 11.33
Expected dividend yield	3.16%
Expected stock price volatility	36.23%
Risk-free interest rate	4.00%
Expected life of options in years	0 years 9 months
2011 Options
Adjusted exercise price	$ 12.83
Expected dividend yield	2.71%
Expected stock price volatility	35.63%
Risk-free interest rate	0.83%
Expected life of options in years	3 years

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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