Summary of Significant Accounting Policies (Black-Scholes option-pricing model) (Details)	12 Months Ended
Jan. 29, 2012 Y	Jan. 30, 2011 Y	Jan. 31, 2010 Y
Accounting Policies [Abstract]
Risk-free interest rate	2.00%	3.10%	2.30%
Assumed volatility	27.30%	26.40%	41.50%
Assumed dividend yield	2.70%	2.90%	3.90%
Assumed lives of options, in years	5	5	6

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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