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Debt - Future Principle and Interest Payments (Details) - USD ($) $ in Thousands | Dec. 26, 2020 | Dec. 28, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal, 2021 | $ 9,521 |
Principal, 2022 | 9,549 |
Principal, 2023 | 1,050 |
Principal, 2024 | 1,080 |
Principal, 2025 | 1,111 |
Principal, 2026 and thereafter | 12,258 |
Principal, total | 34,569 | $ 58,514
Interest, 2021 | 503 |
Interest, 2022 | 377 |
Interest, 2023 | 290 |
Interest, 2024 | 271 |
Interest, 2025 | 248 |
Interest, 2026 and thereafter | 1,185 |
Interest, total | 2,874 |
Total payments, 2021 | 10,024 |
Total payments, 2022 | 9,926 |
Total payments, 2023 | 1,340 |
Total payments, 2024 | 1,351 |
Total payments, 2025 | 1,359 |
Total payments, 2026 and thereafter | 13,443 |
Long-term debt, maturities, total payments due | 37,443 |
FRT Term Loan |  |
Debt Instrument [Line Items] |  |
Principal, total | $ 17,100 |
Interest rate at period end | 1.24% |
Building Term Loan |  |
Debt Instrument [Line Items] |  |
Principal, total | $ 17,500 |
Interest rate at period end | 1.90% |

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