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Income Taxes - Tax rate reconciliation (Details) | 12 Months Ended
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Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Reconciliation of federal statutory tax rate to effective tax rate |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00%
Foreign tax rate benefit | (9.20%) | (33.20%) | (6.20%)
Current period valuation allowance | (18.90%) | 0.00% | 0.00%
Change in prior period valuation allowance | (12.90%) | (1.50%) | (0.30%)
GILTI and Subpart F income, net of foreign tax credits | (4.30%) | (24.20%) | 16.50%
(Nondeductible) nontaxable foreign items | (3.10%) | (26.00%) | 4.50%
(Nondeductible) nontaxable domestic items | (0.90%) | (3.60%) | 0.70%
Nondeductible officer compensation | (0.80%) | 1.30% | 2.00%
Return to provision adjustments | (0.30%) | 16.50% | (2.00%)
State tax expense | 0.00% | (1.50%) | 1.20%
Base erosion and anti-abuse tax | 0.00% | (7.40%) | 0.00%
Other tax effects of equity compensation | 0.10% | 1.10% | (0.30%)
Foreign withholding taxes | 0.30% | (2.20%) | 0.40%
Excess tax benefit of stock-based compensation | 0.60% | 4.00% | (1.10%)
Release of prior year unrecognized tax benefits | 1.20% | 0.00% | (0.40%)
Research and development tax credits | 4.20% | 26.90% | (5.50%)
Other | (0.40%) | (1.10%) | (0.90%)
Effective tax rate | (23.40%) | (29.90%) | 29.60%

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