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Debt - Maturity Schedule (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Debt Instrument [Line Items]
Principal payments - Remainder of 2020	$ 2,278
Principal payments - 2021	9,133
Principal payments - 2022	9,161
Principal payments - 2023	1,050
Principal payments - 2024	1,080
Principal payments - Thereafter	13,368
Term loans	36,070	$ 58,514
Interest payments - Remainder of 2020	145
Interest payments - 2021	503
Interest payments - 2022	377
Interest payments - 2023	290
Interest payments - 2024	271
Interest payments - Thereafter	1,433
Interest payments - Total	3,019
Remainder 2020	2,423
2021	9,636
2022	9,538
2023	1,340
2024	1,351
Thereafter	14,801
Total	$ 39,089
Building Term Loan [Member] | Minimum
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.91%
FRT Term Loan | Minimum
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.30%

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