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Stock-based Compensation - Summary of Fair Value Stock Option Assumptions (Detail)	12 Months Ended
	Dec. 29, 2012
Schedule Of Stock Options [Line Items]
Expected life	6 years 1 month 6 days
Expected volatility	68.80%
Dividend yield
Risk-free interest rate	1.00%

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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