Share-Based Compensation-Valuation Parameters (Details 1) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Employee Stock Option [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Expected volatility	35.00%	45.00%	37.00%	43.00%
Risk-free interest rate	1.21%	0.51%	0.73%	0.60%
Expected term	4 years 4 months	4 years 4 months	4 years 5 months	4 years 4 months
Estimated annual forfeiture rate	8.51%	8.59%	8.51%	8.59%
Weighted average fair value at grant date	$ 14.66	$ 15.39	$ 16.26	$ 16.63
Employee Stock Purchase Plan Shares [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Expected volatility	35.00%	44.00%	34.00%	41.00%
Risk-free interest rate	0.08%	0.14%	0.11%	0.15%
Expected term	0 years 6 months	0 years 6 months	0 years 6 months	0 years 6 months
Weighted average fair value at grant date	$ 13.72	$ 11.38	$ 13.08	$ 11.87
Maximum [Member] | Employee Stock Option [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	1.63%	0.00%	1.63%	0.00%
Maximum [Member] | Employee Stock Purchase Plan Shares [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	1.63%	0.00%	1.63%	0.00%
Minimum [Member] | Employee Stock Option [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum [Member] | Employee Stock Purchase Plan Shares [Member]
Fair value of stock options granted to employees, officers and non-employee board members and ESPP shares granted to employees
Dividend yield	0.00%	0.00%	0.00%	0.00%