Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Stock-based compensation costs
Share based compensation cost before tax	$ 8,620,000	$ 7,931,000	$ 22,304,000	$ 23,796,000
Income tax benefit	904,000	988,000	1,822,000	4,199,000
Share based compensation cost after tax	7,716,000	6,943,000	20,482,000	19,597,000
Net reduction in selling, general and administrative expense		500,000		1,900,000
Total unrecognized compensation costs related to awards	60,100,000		60,100,000
Weighted-average period of recognition of unrecognized compensation costs			2 years 3 months 18 days
2009 Stock Incentive Plan
Stock-based compensation costs
Term of plan			10 years
Cost of revenues
Stock-based compensation costs
Share based compensation cost before tax	269,000	261,000	785,000	938,000
Research and development
Stock-based compensation costs
Share based compensation cost before tax	3,729,000	3,039,000	10,551,000	9,595,000
Selling, general and administrative
Stock-based compensation costs
Share based compensation cost before tax	$ 4,622,000	$ 4,631,000	$ 10,968,000	$ 13,263,000