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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 02, 2022 | Apr. 03, 2021
Stock-based compensation costs |  |
Stock based compensation costs | $ 12,875 | $ 11,368
Income tax benefit | 1,845 | 682
Share based compensation costs after tax | 11,030 | 12,161
Total unrecognized compensation costs related to awards | $ 87,300 |
Weighted-average period of recognition of unrecognized compensation costs | 2 years 3 months 18 days |
Continuing operations |  |
Stock-based compensation costs |  |
Share based compensation costs after tax | $ 11,030 | 10,686
Discontinued operations |  |
Stock-based compensation costs |  |
Share based compensation costs after tax |  | 1,475
Cost of revenues |  |
Stock-based compensation costs |  |
Stock based compensation costs | 272 | 236
Research and development |  |
Stock-based compensation costs |  |
Stock based compensation costs | 6,991 | 5,630
Selling, general and administrative |  |
Stock-based compensation costs |  |
Stock based compensation costs | $ 5,612 | $ 5,502

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