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Summary of Significant Accounting Policies - Vendor Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 27, 2025 | Dec. 28, 2024 | Dec. 30, 2023
Summary of Significant Accounting Policies |  |  |
Cost of goods sold, vendor allowances | $ 124,900 | $ 122,900 | $ 106,900
Vendor paid cooperative advertising credits | 2,300 | 2,800 | $ 3,100
Accounts receivable, earned advertising credits | 431 | 318 |
Accounts receivable, earned promotional discounts | 11,000 | 10,100 |
Unearned income for vendor programs | $ 1,500 | $ 1,600 |

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

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- Definition Accounts Receivable, Earned Advertising Credits + References No definition available. + Details
Name: | wmk_AccountsReceivableEarnedAdvertisingCredits
Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Accounts Receivable, Earned Promotional Discounts + References No definition available. + Details
Name: | wmk_AccountsReceivableEarnedPromotionalDiscounts
Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Vendor Allowances recorded as credits in Cost of Goods Sold + References No definition available. + Details
Name: | wmk_CostOfGoodsSoldVendorAllowances
Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unearned income included in accrued liabilities for unearned vendor programs under long-term contracts for display and shelf space allocation. + References No definition available. + Details
Name: | wmk_UnearnedIncomeForVendorPrograms
Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Vendor Paid Cooperative Advertising Credits + References No definition available. + Details
Name: | wmk_VendorPaidCooperativeAdvertisingCredits
Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration