Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 03, 2021	Jul. 04, 2020	Jul. 03, 2021	Jul. 04, 2020
Stock-based compensation costs
Stock based compensation costs	$ 11,252	$ 11,818	$ 22,620	$ 24,461
Income tax benefit	577	945	1,259	2,122
Share based compensation costs after tax	10,675	10,873	21,361	22,339
Total unrecognized compensation costs related to awards	110,800		$ 110,800
Weighted-average period of recognition of unrecognized compensation costs			2 years 4 months 24 days
Cost of revenues
Stock-based compensation costs
Stock based compensation costs	199	200	$ 436	375
Research and development
Stock-based compensation costs
Stock based compensation costs	5,488	5,612	11,118	11,534
Selling, general and administrative
Stock-based compensation costs
Stock based compensation costs	$ 5,565	$ 6,006	$ 11,066	$ 12,552

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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