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Assumptions Used to Determine Fair Value of Options (Detail)	12 Months Ended
	Dec. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	50.10%
Dividend yield
Risk-free interest rate	0.70%
Expected life, in years	5 years 3 months 29 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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