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Capital Stock (Details)	12 Months Ended
Capital Stock (Details)	Dec. 29, 2012	Dec. 25, 2010
Summary of valuation assumptions used to calculate the fair value of options granted
Expected dividend yield	0.00%	0.00%
Expected stock price volatility	59.00%	55.00%
Risk-free interest rate	0.90%	2.30%
Expected life of options	4 years 8 months 12 days	4 years 8 months 12 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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