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Shareholders' Equity - Summary of Weighted Average Assumptions Used for Estimation of Fair Value (Detail)	12 Months Ended
	Jan. 01, 2012	Jan. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk free interest rate	0.90%	2.10%
Expected option life	5 years 9 months	5 years 9 months
Expected volatility	65.00%	61.00%
Expected dividend yield	0.50%	0.40%

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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