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Stock-Based Compensation - Stock-based compensation costs (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 54,799 | $ 50,077 | $ 44,752
Income tax benefit | 2,476 | 8,890 | 11,073
Share based compensation costs after tax | 52,323 | 41,187 | 33,679
Total unrecognized compensation costs related to awards | $ 59,600 |  |
Weighted-average period of recognition of unrecognized compensation costs | 2 years |  |
Reserved shares of common stock for future issuance | 2,592 |  |
Cost of revenues |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 1,316 | 1,238 | 1,090
Research and development |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | 26,187 | 23,867 | 21,771
Selling, general and administrative |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 27,296 | $ 24,972 | $ 21,891
2009 Stock Incentive Plan |  |  |
Stock-Based Compensation |  |  |
Reserved shares of common stock for future issuance | 1,815 |  |
2009 Employee Stock Purchase Plan |  |  |
Stock-Based Compensation |  |  |
Reserved shares of common stock for future issuance | 777 |  |

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