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Income Taxes (Narrative) (Details) $ in Thousands | 2 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 30, 2016 store | Dec. 31, 2018 | Dec. 29, 2018 USD ($) | Dec. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) store | Dec. 26, 2015
Income Taxes [Line Items] |  |  |  |  |  |
Federal tax rate |  | 21.00% |  | 35.00% | 35.00% | 35.00%
Effective tax rate |  |  | 23.60% | (24.50%) | 30.10% |
2017 tax reform |  |  | $ 657 | $ (49,336) |  |
Effective tax rate, excluding bargain purchase gain |  |  |  |  | 37.20% |
Unrecognized tax benefits that would impact effective tax rate |  |  | $ 1,714 | 1,567 | $ 1,860 |
Earliest Tax Year [Member] | PENNSYLVANIA |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open Tax Year |  |  | 2015 |  |  |
Latest Tax Year [Member] | PENNSYLVANIA |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Open Tax Year |  |  | 2018 |  |  |
Federal [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income Taxes Paid |  |  | $ 4,500 | 12,000 | 27,300 |
State [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income Taxes Paid |  |  | 2,100 | $ 1,000 | $ 3,700 |
Operating Loss Carryforwards |  |  | $ 101,800 |  |  |
Operating Loss Carryforwards, Expiration Date |  |  | Jan. 01, 2027 |  |  |
Food Lion, LLC [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Number of stores acquired | store | 38 |  |  |  | 38 |

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