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Retirement Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 27, 2014 | Dec. 28, 2013
Retirement Plans [Abstract] |  |
Number of supplemental retirement plans | 3 wmk_NumberOfSupplementalRetirementPlans |
Retirement Plans, Accumulated Benefit Obligation | $ 9,646 wmk_RetirementPlansAccumulatedBenefitObligation | $ 9,352 wmk_RetirementPlansAccumulatedBenefitObligation
Deferred Compensation Arrangement with Individual, Requisite Service Period | 6 years |

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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of supplemental retirement plans covering highly compensated employees. + References No definition available. + Details
Name: | wmk_NumberOfSupplementalRetirementPlans
Namespace Prefix: | wmk_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition This represents the present value of the accumulated benefits of the Company's non-qualified supplemental executive retirement plan (SERP) and the non-qualified pharmacist deferred compensation plan, which are recognized in the balance sheet as a noncurrent liability. Both the SERP and the pharmacist deferred compensation plan are designed to provide retirement benefits and salary deferral opportunities because of limitations imposed by the Internal Revenue Code and the Regulations implemented by the Internal Revenue Service. The plans are unfunded and accounted for on an accrual basis. + References No definition available. + Details
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Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant