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Fair Value Assumptions (Details) (Stock Options)	12 Months Ended
Fair Value Assumptions (Details) (Stock Options)	Dec. 29, 2012	Dec. 31, 2011
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	0.35%	1.83%
Dividend yield	0.00%	0.00%
Expected life	3 years 3 months 18 days	4 years 10 months 24 days
Volatility	38.02%	49.57%

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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