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Income Taxes - Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Summary of the activity related to gross unrecognized tax benefits |  |  |
Beginning balance | $ 4,868 | $ 4,109 | $ 3,677
Additions based on tax positions related to current year | 970 | 737 | 872
Additions based on tax positions related to prior years | 0 | 22 | 0
Reductions based on tax positions related to prior years | (5) | 0 | (6)
Reductions for tax positions as a result of a lapse of the applicable statute of limitations | (1,406) | 0 | (434)
Ending balance | $ 4,427 | $ 4,868 | $ 4,109

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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