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Note 5. Equity Incentive Plan and Stock-Based Compensation (Detail) - Valuation Assumption - Stock Options (Stock Options [Member])	3 Months Ended
	Mar. 31, 2013	Mar. 25, 2012
Stock Options [Member]
Expected volatility	54.03%	51.36%
Risk-free interest rate	0.60%	0.92%
Expected term (in years)	4 years 127 days	4 years 127 days
Dividend yield	0.00%	0.00%

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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