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Benefit Plans (Details 5)	3 Months Ended		6 Months Ended
Benefit Plans (Details 5)	Jul. 01, 2011	Jul. 02, 2010	Jul. 01, 2011	Jul. 02, 2010
Employee Stock Option [Member]
Weighted average assumptions:
Expected life (years)	4.75	4.75	4.75	4.75
Volatility	52.00%	55.00%	54.00%	56.00%
Risk-free interest rate	2.50%	2.20%	2.10%	2.40%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Employee Stock Purchase Plan [Member]
Weighted average assumptions:
Expected life (years)	0.50	0.50	0.50	0.50
Volatility	43.00%	50.00%	43.00%	50.00%
Risk-free interest rate	0.30%	0.40%	0.30%	0.40%
Dividend yield	0.00%	0.00%	0.00%	0.00%

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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