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Stock-Based Compensation Expense (Details 1) (USD $)	3 Months Ended
Stock-Based Compensation Expense (Details 1) (USD $)	Apr. 01, 2012 Y	Apr. 03, 2011 Y
Weighted average assumptions in fair value of option grant
Estimated grant date fair value per share	$ 2.86	$ 2.08
Expected life (years)	4.46	4.45
Risk-free interest rate	1.00%	2.00%
Volatility	47.00%	47.00%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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