Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Stock-based compensation costs
Share based compensation cost before tax	$ 9,614,000	$ 8,620,000	$ 28,173,000	$ 22,304,000
Income tax benefit	1,158,000	904,000	3,056,000	1,822,000
Share based compensation cost after tax	8,456,000	7,716,000	25,117,000	20,482,000
Total unrecognized compensation costs related to awards	60,300,000		60,300,000
Weighted-average period of recognition of unrecognized compensation costs			2 years 1 month 6 days
Cost of revenues
Stock-based compensation costs
Share based compensation cost before tax	201,000	269,000	574,000	785,000
Research and development
Stock-based compensation costs
Share based compensation cost before tax	4,713,000	3,729,000	13,282,000	10,551,000
Selling, general and administrative
Stock-based compensation costs
Share based compensation cost before tax	$ 4,700,000	$ 4,622,000	$ 14,317,000	$ 10,968,000