Stock Compensation Plans and Stock Based Compensation (Details 8) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Weighted-average grant date fair value of purchase rights granted under ESPP and weighted-average assumptions used in model
Expected volatility	40.00%	46.40%	44.90%
Risk-free interest rate	0.86%	0.79%	2.18%
Expected term (in years)	4 years 8 months 12 days	4 years 7 months 6 days	4 years 8 months 12 days
Weighted-average fair value of options granted	$ 4.93	$ 4.57	$ 3.93
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	25.70%	31.40%	38.40%
Risk-free interest rate	0.09%	0.12%	0.17%
Expected term (in years)	6 months	6 months	6 months
Weighted-average fair value of options granted	$ 3.21	$ 2.78	$ 2.48