Stock Compensation Plans and Stock Based Compensation (Details 11) (USD $)	12 Months Ended
	Dec. 31, 2011 Years	Jan. 01, 2011 Years	Jan. 02, 2010 Years
Weighted-average grant date fair value of purchase rights granted under ESPP and weighted-average assumptions used in model
Dividend yield
Expected volatility	44.90%	45.90%	65.80%
Risk-free interest rate	2.18%	2.45%	1.91%
Expected term (in years)	4.7	4.6	4.5
Weighted-average fair value of options granted	$ 3.93	$ 2.51	$ 2.33
Purchase rights granted [Member]
Weighted-average grant date fair value of purchase rights granted under ESPP and weighted-average assumptions used in model
Dividend yield
Expected volatility	38.40%	39.10%	51.30%
Risk-free interest rate	0.17%	0.19%	0.21%
Expected term (in years)	0.5	0.5	0.3
Weighted-average fair value of options granted	$ 2.48	$ 1.72	$ 1.96