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Income Taxes - Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 25, 2021 | Dec. 26, 2020 | Dec. 28, 2019
Income Tax Reconciliation |  |  |
U.S. statutory federal tax rate | $ 20,685 | $ 17,887 | $ 10,723
State taxes and credits, net of federal benefit | 811 | 663 | 441
Stock-based compensation | (6,118) | (4,962) | (911)
Research and development credits | (7,153) | (6,576) | (6,436)
Foreign taxes at rates different than the U.S. | 2,286 | 415 | 1,454
Other permanent differences | 2,043 | 400 | (148)
Global intangible low-taxed income | 0 | 0 | 1,369
Foreign derived intangible income | (2,486) | (3,668) | 0
Change in valuation allowance | 2,231 | 1,862 | 2,567
Other | 2,277 | 631 | 2,658
Total provision for income taxes | $ 14,576 | $ 6,652 | $ 11,717

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