Stock-Based Compensation (Assumptions Of Stock Compensation Plans) (Details)	9 Months Ended
Aug. 31, 2011	Aug. 31, 2010
Dividend yield	2.40%	2.70%
Expected lives	6.4	6.2
Minimum [Member]
Risk-free interest rates	0.10%	0.20%
Expected volatility	15.20%	20.40%
Maximum [Member]
Risk-free interest rates	3.50%	3.80%
Expected volatility	22.20%	24.20%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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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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