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Stock Options (Details) (USD $)	9 Months Ended
Stock Options (Details) (USD $)	Jun. 30, 2011 2010 Options	Jun. 30, 2012 2011 Options
Adjusted exercise price	$ 11.33	$ 12.83
Expected dividend yield	3.16%	2.71%
Expected stock price volatility	36.23%	35.63%
Risk-free interest rate	4.00%	0.83%
Expected life of options in years	1 year 9 months	4 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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