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Retirement Plans (Estimated future benefit payments) (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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Retirement Plans [Abstract] |
2017 | $ 1,976
Thereafter | $ 1,013

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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of benefits from a defined benefit plan expected to be paid consistently per year once stabalized. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | wmk_Definedbenefitplanexpectedconstantpayments
Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant