Stock-Based Compensation (Details) (USD $)	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Stock-based compensation costs
Share based compensation cost before tax	$ 10,519,000	$ 9,277,000
Income tax benefit	1,304,000	1,311,000
Share based compensation cost after tax	9,215,000	7,966,000
Total unrecognized compensation costs related to awards	76,700,000
Weighted-average period of recognition of unrecognized compensation costs	2 years 4 months 24 days
Cost of revenues
Stock-based compensation costs
Share based compensation cost before tax	230,000	195,000
Research and development
Stock-based compensation costs
Share based compensation cost before tax	4,795,000	4,241,000
Selling, general and administrative
Stock-based compensation costs
Share based compensation cost before tax	$ 5,494,000	$ 4,841,000

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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Subparagraph (SAB TOPIC 14.F)

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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- Definition

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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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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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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- Definition

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

+ References

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-Name Accounting Standards Codification

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