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Benefit Plans - Summarizes The Components Of Net Periodic Benefit Cost (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
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]              
Service cost $ 35 $ 40 $ 107 $ 120 $ 159 $ 142 $ 25
Interest cost 38 48 114 144 190 231 41
Expected return on plan assets (58) (64) (180) (192) (255) (232) (42)
Amortization of net loss 9 0 19 0      
Net periodic benefit cost $ 24 $ 24 $ 60 $ 72 $ 94 $ 141 $ 24