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Acquisition of Business (Narrative) (Details) $ in Thousands |  |  |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 30, 2016 USD ($) store | Aug. 01, 2016 USD ($) store | Aug. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Oct. 30, 2016 USD ($) store site | Dec. 31, 2016 USD ($) | Sep. 24, 2016 USD ($) | Jun. 25, 2016 USD ($) | Mar. 26, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 26, 2015 USD ($) | Dec. 27, 2014 USD ($)
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 63,632 | $ 0 | $ 0
Gain on bargain purchase |  |  |  |  |  | $ 23,879 | $ 0 | $ 0 | $ 0 |  |  | 23,879 | 0 | $ 0
Goodwill |  |  |  | $ 52,330 |  | $ 52,330 |  |  |  | $ 52,330 | $ 52,330 | $ 52,330 | $ 35,162 |
Mars Super Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  |  | $ 38,000 |  |  |
Number of stores acquired | store |  | 5 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  | $ 24,600 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 13,255 |  |  |  |  |  |  |  |  |  |  |  |
Number of lease obligations assumed |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Number of new lease agreements due to acquisition |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes |  | $ 13,300 |  |  |  |  |  |  |  |  |  |  |  |
Food Lion, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | $ 92,500 |  |  |  |
Number of stores acquired | store |  |  |  |  | 38 |  |  |  |  |  |  |  |  |
Number of owned stores acquired | site |  |  |  |  | 8 |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 29,400 |  |  |  |  |  |  |  |  |
Gain on bargain purchase | $ 23,879 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lease obligations assumed |  |  |  |  | 30 |  |  |  |  |  |  |  |  |
Food Lion, LLC [Member] | MARYLAND |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stores acquired | store |  |  |  |  | 21 |  |  |  |  |  |  |  |  |
Food Lion, LLC [Member] | VIRGINIA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stores acquired | store |  |  |  |  | 13 |  |  |  |  |  |  |  |  |
Food Lion, LLC [Member] | DELAWARE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stores acquired | store |  |  |  |  | 4 |  |  |  |  |  |  |  |  |
Nell's Family Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |
Number of stores acquired | store | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 13,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price payable | 3,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price payable, term |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |
Goodwill | 3,913 |  |  |  | $ 3,913 |  |  |  |  |  |  |  |  |
Goodwill deductible for tax purposes | $ 3,900 |  |  |  | $ 3,900 |  |  |  |  |  |  |  |  |
C&S Wholesale Grocers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 7,900 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Land |  |  | 1,900 |  |  |  |  |  |  |  |  |  |  |
Buildings |  |  | 5,900 |  |  |  |  |  |  |  |  |  |  |
Equipment |  |  | $ 112 |  |  |  |  |  |  |  |  |  |  |

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