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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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