Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Stock-based compensation costs
Share based compensation cost before tax	$ 9,222	$ 9,614	$ 30,798	$ 28,173
Income tax benefit	1,089	1,158	3,575	3,056
Share based compensation cost after tax	8,133	8,456	27,223	25,117
Total unrecognized compensation costs related to awards	55,300		$ 55,300
Weighted-average period of recognition of unrecognized compensation costs			2 years
Cost of revenues
Stock-based compensation costs
Share based compensation cost before tax	249	201	$ 708	574
Research and development
Stock-based compensation costs
Share based compensation cost before tax	4,623	4,713	14,378	13,282
Selling, general and administrative
Stock-based compensation costs
Share based compensation cost before tax	$ 4,350	$ 4,700	$ 15,712	$ 14,317

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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