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Summary of Significant Accounting Policies - Investments in Unconsolidated Affiliates (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) restaurant | Jan. 02, 2018 USD ($) restaurant | Oct. 01, 2019
Investments in unconsolidated affiliates |  |  |  |
Equity investments in number of restaurants | restaurant |  | 2 | 2 |
Impairment of assets | $ | $ 0 | $ 0 | $ 0 |
North Italia and Flower Child |  |  |  |
Investments in unconsolidated affiliates |  |  |  |
Ownership percentage |  |  |  | 49.00%

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