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Stock-Based Compensation - Stock-based compensation costs (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 50,077 | $ 44,752 | $ 39,628
Income tax benefit | 8,890 | 11,073 | 8,496
Share based compensation costs after tax | 41,187 | 33,679 | 31,132
Total unrecognized compensation costs related to awards | $ 65,400 |  |
Weighted-average period of recognition of unrecognized compensation costs | 1 year 10 months 24 days |  |
Reserved shares of common stock for future issuance | 3,328 |  |
2009 Stock Incentive Plan |  |  |
Stock-Based Compensation |  |  |
Reserved shares of common stock for future issuance | 2,343 |  |
2009 Employee Stock Purchase Plan |  |  |
Stock-Based Compensation |  |  |
Reserved shares of common stock for future issuance | 985 |  |
Cost of revenues |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 1,238 | 1,090 | 1,070
Research and development |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | 23,867 | 21,771 | 19,573
Selling, general and administrative |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 24,972 | $ 21,891 | $ 18,985

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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