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Retirement Plans (Retirement Plan Costs) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Expense | $ 5,171 us-gaap_PensionExpense | $ 5,794 us-gaap_PensionExpense | $ 4,804 us-gaap_PensionExpense
Retirement savings plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Expense | 1,752 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_RetirementSavingsPlanMember | 1,715 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_RetirementSavingsPlanMember | 1,560 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_RetirementSavingsPlanMember
Profit-sharing plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Expense | 1,258 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_ProfitSharingPlanMember | 1,750 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_ProfitSharingPlanMember | 1,650 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_ProfitSharingPlanMember
Deferred compensation plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Expense | 1,328 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_DeferredCompensationPlanMember | 126 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_DeferredCompensationPlanMember | 291 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_DeferredCompensationPlanMember
Supplemental retirement plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Expense | 1,061 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_SupplementalRetirementPlanMember | 2,025 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_SupplementalRetirementPlanMember | 1,105 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_SupplementalRetirementPlanMember
Pharmacist deferred compensation plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Expense | $ (228)us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_PharmacistDeferredCompensationPlanMember | $ 178 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_PharmacistDeferredCompensationPlanMember | $ 198 us-gaap_PensionExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = wmk_PharmacistDeferredCompensationPlanMember

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- Definition The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -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 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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