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v2.4.1.9

Summary of Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 28, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012 | Mar. 01, 2014
SERP Investment |  | $ 9,121,000 wmk_SerpInvestment | $ 8,752,000 wmk_SerpInvestment | $ 6,900,000 wmk_SerpInvestment |
Cash Equivalents, at Carrying Value |  | 14,400,000 us-gaap_CashEquivalentsAtCarryingValue | 7,200,000 us-gaap_CashEquivalentsAtCarryingValue |  |
Allowance for Doubtful Accounts Receivable |  | 1,578,000 us-gaap_AllowanceForDoubtfulAccountsReceivable | 1,882,000 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |
Impairment of Long-Lived Assets Held-for-use | 2,100,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 2,088,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse | 0 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |
Self Insurance, Maximum of Workers Compensation Claims Liability per Associate per Claim |  | 2,000,000 wmk_SelfInsuranceMaximumOfWorkersCompensationClaimsLiabilityPerAssociatePerClaim |  |  |
Stop loss insurance specific deductible |  |  |  |  | 500,000 wmk_StopLossInsuranceSpecificDeductible
Stop loss insurance aggregating deductible |  |  |  |  | 250,000 wmk_StopLossInsuranceAggregatingDeductible
Cost of Goods Sold, Vendor Allowances |  | 89,500,000 wmk_CostOfGoodsSoldVendorAllowances | 76,400,000 wmk_CostOfGoodsSoldVendorAllowances | 75,100,000 wmk_CostOfGoodsSoldVendorAllowances |
Vendor Paid Cooperative Advertising Credits |  | 16,000,000 wmk_VendorPaidCooperativeAdvertisingCredits | 16,000,000 wmk_VendorPaidCooperativeAdvertisingCredits | 16,400,000 wmk_VendorPaidCooperativeAdvertisingCredits |
Accounts Receivable, Earned Advertising Credits |  | 395,000 wmk_AccountsReceivableEarnedAdvertisingCredits | 440,000 wmk_AccountsReceivableEarnedAdvertisingCredits |  |
Accounts Receivable, Earned Promotional Discounts |  | 5,700,000 wmk_AccountsReceivableEarnedPromotionalDiscounts | 5,800,000 wmk_AccountsReceivableEarnedPromotionalDiscounts |  |
Unearned Income for Vendor Programs |  | 734,000 wmk_UnearnedIncomeForVendorPrograms | 911,000 wmk_UnearnedIncomeForVendorPrograms |  |
Advertising Expense |  | 24,600,000 us-gaap_AdvertisingExpense | 23,500,000 us-gaap_AdvertisingExpense | 23,500,000 us-gaap_AdvertisingExpense |
ASU 2014-15, Presentation of Financial Statements - Going Concern [Member] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 0 us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification / us-gaap_AdjustmentsForNewAccountingPronouncementsAxis = wmk_Asu201415PresentationOfFinancialStatementsGoingConcernMember |  |  |
Depreciation Expense [Member] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | (11,500,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmk_DepreciationExpenseMember |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  |  | (6,800,000)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmk_DepreciationExpenseMember |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Basic Earnings Per Share |  |  | $ (0.25)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnBasicEarningsPerShare / us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis = wmk_DepreciationExpenseMember |  |
Prior to March 1, 2012 [Member] |  |  |  |  |
Self Insurance, Annual Maximum of Health Claims Liability per Associate |  | 750,000 wmk_SelfInsuranceAnnualMaximumOfHealthClaimsLiabilityPerAssociate / us-gaap_StatementScenarioAxis = wmk_PriorToMarch12012Member |  |  |
Between March 1, 2012 to March 1, 2013 [Member] |  |  |  |  |
Self Insurance, Annual Maximum of Health Claims Liability per Associate |  | 1,250,000 wmk_SelfInsuranceAnnualMaximumOfHealthClaimsLiabilityPerAssociate / us-gaap_StatementScenarioAxis = wmk_BetweenMarch12012ToMarch12013Member |  |  |
Between March 1, 2013 to March 1, 2014 [Member] |  |  |  |  |
Self Insurance, Annual Maximum of Health Claims Liability per Associate |  | 2,000,000 wmk_SelfInsuranceAnnualMaximumOfHealthClaimsLiabilityPerAssociate / us-gaap_StatementScenarioAxis = wmk_BetweenMarch12013ToMarch12014Member |  |  |
Maximum [Member] |  |  |  |  |
Property and Casualty Insurance, Deductible |  | 1,000,000 wmk_PropertyAndCasualtyInsuranceDeductible / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Minimum [Member] |  |  |  |  |
Property and Casualty Insurance, Deductible |  | $ 100,000 wmk_PropertyAndCasualtyInsuranceDeductible / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |

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