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Benefit Plans (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 26, 2021 | Dec. 31, 2020
Retirement Benefits [Abstract] |  |
Summary of Changes In Defined Benefit Obligations |  | The benefit obligation, accumulated benefit obligation, fair value of Plan assets, funded status of the Plan and benefits paid as of and for the year ended December 31, 2020 and 2019 are as follows:
|  | 2020 |  |  | 2019 |
Change in Benefit Obligations |  |  |  |  |  |  |  |
Beginning benefit obligation |  | $ | 5,993 |  |  | $ | 5,627 |
Service cost |  |  | 159 |  |  |  | 142 |
Interest cost |  |  | 190 |  |  |  | 231 |
Benefits paid |  |  | (339 | ) |  |  | (346 | )
Expenses paid |  |  | (142 | ) |  |  | (158 | )
Actuarial loss |  |  | 690 |  |  |  | 497 |
Ending benefit obligation |  |  | 6,551 |  |  |  | 5,993 |
Change in Plan Assets |  |  |  |  |  |  |  |
Beginning fair value of plan assets |  |  | 4,089 |  |  |  | 3,740 |
Actual return on plan assets |  |  | 559 |  |  |  | 568 |
Employer contributions |  |  | 589 |  |  |  | 285 |
Benefits paid from plan assets |  |  | (339 | ) |  |  | (346 | )
Summary of Changes In Defined Benefit Plan Assets |  | The benefit obligation, accumulated benefit obligation, fair value of Plan assets, funded status of the Plan and benefits paid as of and for the year ended December 31, 2020 and 2019 are as follows:
Expenses paid |  |  | (142 | ) |  |  | (158 | )
Ending fair value of plan assets |  |  | 4,756 |  |  |  | 4,089 |
Ending funded status |  | $ | (1,795 | ) |  | $ | (1,904 | )
Amounts Recorded in the Consolidated Balance Sheets |  |  |  |  |  |  |  |
Current liabilities |  | $ | — |  |  | $ | — |
Non-current liabilities |  |  | (1,795 | ) |  |  | (1,904 | )
Net amount recorded |  | $ | (1,795 | ) |  | $ | (1,904 | )
Amounts Recorded in Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | (293 | ) |  | $ | (123 | )
Summarizes the Components of Net Periodic Benefit Cost | The following summarizes the components of net periodic benefit cost for the defined benefit pension plan:
|  | For the thirteen weeks ended |  |  | For the thirty-nine weeks ended |
|  | September 26, 2021 |  |  | September 27, 2020 |  |  | September 26, 2021 |  |  | September 27, 2020 |
Components of Expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 35 |  |  | $ | 40 |  |  | $ | 107 |  |  | $ | 120 |
Interest cost |  |  | 38 |  |  |  | 48 |  |  |  | 114 |  |  |  | 144 |
Expected return on plan assets |  |  | (58 | ) |  |  | (64 | ) |  |  | (180 | ) |  |  | (192 | )
Amortization of net loss |  |  | 9 |  |  |  | — |  |  |  | 19 |  |  |  | — |
Net periodic benefit cost |  | $ | 24 |  |  | $ | 24 |  |  | $ | 60 |  |  | $ | 72 |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Components of Expense |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 159 |  |  | $ | 142 |  |  | $ | 25 |
Interest cost |  |  | 190 |  |  |  | 231 |  |  |  | 41 |
Expected return on plan assets |  |  | (255 | ) |  |  | (232 | ) |  |  | (42 | )
Net periodic benefit cost |  | $ | 94 |  |  | $ | 141 |  |  | $ | 24 |
Summary of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) |  | The amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive loss:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Net loss |  | $ | 822 |  |  | $ | 436 |  |  | $ | 275 |
Summary of Defined Benefit Plan, Assumptions |  | Weighted-average assumptions used to determine net cost:
|  | 2020 |  |  | 2019 |
Discount rate |  |  | 3.25 | % |  |  | 4.32 | %
Expected return on plan assets |  |  | 6.35 | % |  |  | 6.50 | %
Summary of Defined Benefit Plan Weighted Average Assumptions Used In Determining The Benefit Obligation |  | Weighted-average assumptions used to determine the benefit obligation:
|  | 2020 |  |  | 2019 |
Discount rate |  |  | 2.38 | % |  |  | 3.25 | %
Summary of Defined Benefit Plan, Plan Assets, Allocation |  | The fair value of the Plan assets at December 31, 2020 and 2019 and target asset allocation for 2021, by asset category, are as follows:
|  | Target Allocation 2021 |  |  | 2020 |  |  | 2019 |
Common stock |  |  | 35 | % |  | $ | 1,562 |  |  | $ | 1,748 |
Mutual funds |  |  | 25 | % |  |  | 2,202 |  |  |  | 856 |
Corporate/government bonds |  |  | 40 | % |  |  | 982 |  |  |  | 1,473 |
Cash and cash equivalents |  |  | 0 | % |  |  | 10 |  |  |  | 12 |
Total |  |  | 100 | % |  | $ | 4,756 |  |  | $ | 4,089 |
Summary of Defined Benefit Plan, Plan Assets, Category |  | The following table presents the fair value measurements of assets measured at fair value on a recurring basis and the fair value hierarchy in which the fair value measurements fall at December 31, 2020 and 2019:
|  | December 31, 2020 |
|  | Fair Value |  |  | Markets for Identical Assets (Level 1) |  |  | Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Common stock |  | $ | 1,562 |  |  | $ | 1,562 |  |  | $ | — |  |  | $ | — |
Mutual funds |  |  | 2,202 |  |  |  | 2,202 |  |  |  | — |  |  |  | — |
Corporate/government bonds |  |  | 982 |  |  |  | — |  |  |  | 982 |  |  |  | — |
Cash and cash equivalents |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |
Total |  | $ | 4,756 |  |  | $ | 3,764 |  |  | $ | 992 |  |  | $ | — |
|  | December 31, 2019 |
|  | Fair Value |  |  | Markets for Identical Assets (Level 1) |  |  | Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Common stock |  | $ | 1,748 |  |  | $ | 1,748 |  |  | $ | — |  |  | $ | — |
Mutual funds |  |  | 856 |  |  |  | 856 |  |  |  | — |  |  |  | — |
Corporate/government bonds |  |  | 1,473 |  |  |  | — |  |  |  | 1,473 |  |  |  | — |
Cash and cash equivalents |  |  | 12 |  |  |  | — |  |  |  | 12 |  |  |  | — |
Total |  | $ | 4,089 |  |  | $ | 2,604 |  |  | $ | 1,485 |  |  | $ | — |
Summary of Defined Benefit Plan Expected Future Benefit Payment |  | Benefit payments are anticipated to be as follows:
2021 |  | $ | 369 |
2022 |  |  | 373 |
2023 |  |  | 375 |
2024 |  |  | 372 |
2025 |  |  | 372 |
2026 — 2030 |  |  | 1,858 |

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