Stockholders' Equity (Details) (Black-Scholes-Merton)	3 Months Ended	6 Months Ended
Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Black-Scholes-Merton
Fair value of stock option granted
Weighted average risk free rate of return	1.30%	1.99%	1.65%	1.82%
Dividend yield
Expected volatility of the market price of the Company's common stock	57.70%	56.80%	57.70%	56.80%
Expected option life (years)	4.1	4.2	4.1	4.2

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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