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Equity-Based Compensation Plans - Equity-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2021 | Jun. 27, 2021 | Mar. 28, 2021 | Sep. 27, 2020 | Jun. 28, 2020 | Mar. 29, 2020 | Sep. 26, 2021 | Sep. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | $ 2,486 | $ 131 | $ 131 | $ 121 | $ 114 | $ 121 |  |  | $ 487 | $ 437
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense |  |  |  |  |  |  |  |  | $ 487 | $ 437
Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | 376 |  |  |  |  |  | $ 376 |  |  |
Profit Interest Units [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | $ 2,110 |  |  | $ 121 |  |  | $ 2,372 | $ 356 |  |

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