Stock Compensation Plans and Stock Based Compensation (Details 11) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Weighted-average grant date fair value of purchase rights granted under ESPP and weighted-average assumptions used in model
Expected volatility	46.40%	44.90%	45.90%
Risk-free interest rate	0.79%	2.18%	2.45%
Expected term (in years)	4 years 7 months 6 days	4 years 8 months 12 days	4 years 7 months 6 days
Weighted-average fair value of options granted	$ 4.57	$ 3.93	$ 2.51
Purchase rights granted [Member]
Weighted-average grant date fair value of purchase rights granted under ESPP and weighted-average assumptions used in model
Expected volatility	31.40%	38.40%	39.10%
Risk-free interest rate	0.12%	0.17%	0.19%
Expected term (in years)	6 months	6 months	6 months
Weighted-average fair value of options granted	$ 2.78	$ 2.48	$ 1.72