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Summary Of Significant Accounting Policies (Weighted Average Assumptions Used In Estimating Fair Value) (Details)	12 Months Ended
	Sep. 30, 2012 Non Performance Based SARs [Member]	Sep. 30, 2011 Non Performance Based SARs [Member]	Sep. 30, 2010 Performance Based SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate	1.59%	2.94%	3.55%
Expected Life (Years)	8 years 3 months	8 years	7 years 9 months
Expected Volatility	24.97%	23.38%	23.25%
Expected Dividend Yield (Quarterly)	0.64%	0.55%	0.64%

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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