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Stock-Based Compensation Expense (Details1)	3 Months Ended		6 Months Ended
Stock-Based Compensation Expense (Details1)	Jul. 01, 2012	Jul. 03, 2011	Jul. 01, 2012	Jul. 03, 2011
Weighted-average assumptions used in estimating the fair values of stock options granted
Risk-free rate	2.00%	3.60%	2.00%	3.60%
Expected dividend yield	1.20%	1.00%	1.20%	1.00%
Expected volatility	44.00%	42.00%	44.00%	42.00%
Expected term (in years)	5 years 8 months 12 days	5 years 2 months 12 days	5 years 8 months 12 days	5 years 4 months 24 days

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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