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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)