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Employee Equity Incentive Plan (Details)	12 Months Ended
Employee Equity Incentive Plan (Details)	Dec. 29, 2012	Dec. 31, 2011
Employee Equity Incentive Plan Details
Volatility	33.22%	31.56%
Expected dividends	0.00%	0.00%
Expected term	5 years 9 months 18 days	5 years 9 months 18 days
Risk-free rate	0.96%	2.20%

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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