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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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Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 60,091 | $ 54,799 | $ 50,077
Income tax benefit | 3,616 | 2,476 | 8,890
Share based compensation costs after tax | 56,475 | 52,323 | 41,187
Total unrecognized compensation costs related to awards | $ 78,600 |  |
Weighted-average period of recognition of unrecognized compensation costs | 2 years 2 months 12 days |  |
Reserved shares of common stock for future issuance | 1,823 |  |
Cost of revenues |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 1,477 | 1,316 | 1,238
Research and development |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | 29,212 | 26,187 | 23,867
Selling, general and administrative |  |  |
Stock-Based Compensation |  |  |
Stock-based compensation cost | $ 29,402 | $ 27,296 | $ 24,972
2009 Stock Incentive Plan |  |  |
Stock-Based Compensation |  |  |
Reserved shares of common stock for future issuance | 1,223 |  |
2009 Employee Stock Purchase Plan |  |  |
Stock-Based Compensation |  |  |
Reserved shares of common stock for future issuance | 600 |  |

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