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Stock Compensation Plans and Stock Based Compensation (Details 2) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility	46.40%	44.90%	45.90%
Risk-free interest rate	0.79%	2.18%	2.45%
Expected term (in years)	4 years 7 months 6 days	4 years 8 months 12 days	4 years 7 months 6 days
Weighted-average fair value of options granted	$ 4.57	$ 3.93	$ 2.51

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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