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Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Mar. 31, 2012
2009 Employee Stock Purchase Plan
Jun. 29, 2013
Cost of revenues
Jun. 30, 2012
Cost of revenues
Jun. 29, 2013
Cost of revenues
Jun. 30, 2012
Cost of revenues
Jun. 29, 2013
Research and development
Jun. 30, 2012
Research and development
Jun. 29, 2013
Research and development
Jun. 30, 2012
Research and development
Jun. 29, 2013
Selling, general and administrative
Jun. 30, 2012
Selling, general and administrative
Jun. 29, 2013
Selling, general and administrative
Jun. 30, 2012
Selling, general and administrative
Stock-based compensation costs                                  
Term of plan         10 years                        
Share based compensation cost before tax $ 7,424,000 $ 9,172,000 $ 13,684,000 $ 15,865,000   $ 263,000 $ 317,000 $ 517,000 $ 677,000 $ 3,483,000 $ 2,954,000 $ 6,821,000 $ 6,556,000 $ 3,678,000 $ 5,901,000 $ 6,346,000 $ 8,632,000
Income tax benefit 170,000 1,661,000 918,000 3,210,000                          
Share based compensation cost after tax 7,254,000 7,511,000 12,766,000 12,655,000                          
Net reduction in selling, general and administrative expense   2,600,000   1,400,000                          
Total unrecognized compensation costs related to awards $ 54,700,000   $ 54,700,000                            
Weighted-average period of recognition of unrecognized compensation costs     2 years 2 months 12 days