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Summary of Significant Accounting Policies - Vendor Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 28, 2024 | Dec. 30, 2023 | Dec. 31, 2022
Summary of Significant Accounting Policies |  |  |
Cost of Goods Sold, Vendor Allowances | $ 122,900 | $ 106,900 | $ 120,000
Vendor Paid Cooperative Advertising Credits | 2,800 | 3,100 | $ 2,900
Accounts Receivable, Earned Advertising Credits | 318 | 450 |
Accounts Receivable, Earned Promotional Discounts | 10,100 | 8,800 |
Unearned Income for Vendor Programs | $ 1,600 | $ 2,400 |

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- References No definition available. + Details
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- Definition Accounts Receivable, Earned Advertising Credits + References No definition available. + Details
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Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Accounts Receivable, Earned Promotional Discounts + References No definition available. + Details
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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
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Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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
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Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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