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Summary of Significant Accounting Policies (Correction for Immaterial Prior Period Misstatements) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
SERP investment |  | $ 9,121 wmk_SerpInvestment | $ 8,752 wmk_SerpInvestment | $ 6,900 wmk_SerpInvestment
Gain on disposition of fixed assets |  | 2,630 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 2,033 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | 1,407 us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Impairment of fixed assets | 2,100 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 2,088 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Opening cash impact of reclassification of fixed asset gains (losses) and associated impairment |  |  | 0 wmk_OpeningCashImpactOfReclassificationOfFixedAssetGainsLossesAndAssociatedImpairment |
Scenario, Previously Reported [Member] |  |  |  |
Gain/loss on disposition/impairment of fixed assets |  |  | $ (55)us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The adjustment made to the opening cash balance due to a reclassification of the gains (losses) and impairment associated with fixed assets. + References No definition available. + Details
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- Definition Amount of investments in level 1 mutual funds related to a non-qualified supplemental executive retirement plan and a non-qualified pharmacist deferred compensation plan for certain of its associates. + References No definition available. + Details
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- Details
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