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Income Taxes - Schedule of Provision and Effective Tax Rates (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2021 | Sep. 27, 2020 | Sep. 26, 2021 | Sep. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Income tax expense | $ (3,301) | $ 5,512 | $ 7,255 | $ 9,656 | $ 8,826 | $ (4,873) | $ (4,575)
Effective tax rates | 9.90% | 28.90% |  | 23.80% | 50.00% |  |
"Expected" tax expense (benefit) |  |  |  |  | $ 8,753 | (906) | (7,389)
State income tax expense (benefit) |  |  |  |  | 335 | (1,005) | (1,115)
Permanent tax differences |  |  |  |  | 167 | 494 | 4,207
Foreign tax rate |  |  |  |  | 389 | 369 | 7
Tax credit |  |  |  |  | (646) | (750) | (120)
Other differences, net |  |  |  |  | $ (172) | $ (3,075) | $ (165)

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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