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System Optimization Gains, Net Assets Held for Sale (Details) $ in Thousands | Sep. 27, 2020 USD ($) number_of_restaurants | Dec. 29, 2019 USD ($) number_of_restaurants
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Long lived assets held for sale |  |
Number of restaurants classified as held for sale | number_of_restaurants | 43 | 0
Net restaurant assets held for sale |  |
Long lived assets held for sale |  |
Assets held for sale | $ 20,178 | $ 0
Other assets held for sale |  |
Long lived assets held for sale |  |
Assets held for sale | $ 2,817 | $ 1,437

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