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Income Taxes - Effective income tax rate reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 27, 2025 | Jun. 28, 2025 | Mar. 29, 2025 | Sep. 28, 2024 | Jun. 29, 2024 | Mar. 30, 2024 | Jun. 28, 2025 | Jun. 29, 2024 | Sep. 27, 2025 | Sep. 28, 2024 | Dec. 27, 2025 | Dec. 28, 2024 | Dec. 30, 2023
Amount |  |  |  |  |  |  |  |  |  |  |  |  |
US federal statutory tax rate |  |  |  |  |  |  |  |  |  |  | $ 26,029 | $ 30,452 | $ 29,957
State and local income tax, net of federal income tax effect |  |  |  |  |  |  |  |  |  |  | 5,252 | 8,594 | 9,579
Nontaxable or nondeductible items |  |  |  |  |  |  |  |  |  |  |  |  |
Limitations on executive compensation |  |  |  |  |  |  |  |  |  |  | 1,246 | 2,137 | 2,709
Other |  |  |  |  |  |  |  |  |  |  | (1,217) |  |
Tax Credits |  |  |  |  |  |  |  |  |  |  | (1,682) | (1,450) |
Changes in unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  | (58) |  |
Other |  |  |  |  |  |  |  |  |  |  | 687 | (810) | (448)
Total | $ 5,374 | $ 8,092 | $ 6,991 | $ 9,467 | $ 9,578 | $ 8,078 | $ 15,084 | $ 17,655 | $ 20,458 | $ 27,122 | $ 30,256 | $ 38,923 | $ 41,797
Percentage |  |  |  |  |  |  |  |  |  |  |  |  |
US federal statutory tax rate |  |  |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
State and local income tax, net of federal income tax effect |  |  |  |  |  |  |  |  |  |  | 4.20% |  |
Nontaxable or nondeductible items |  |  |  |  |  |  |  |  |  |  |  |  |
Limitations on executive compensation |  |  |  |  |  |  |  |  |  |  | 1.00% |  |
Other |  |  |  |  |  |  |  |  |  |  | (1.00%) |  |
Tax credits |  |  |  |  |  |  |  |  |  |  | (1.40%) |  |
Changes in unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  | 0.60% |  |
Effective tax rate |  |  |  |  |  |  |  |  |  |  | 24.40% | 26.90% | 29.30%
Tax Jurisdiction of Domicile [Extensible Enumeration] |  |  |  |  |  |  |  |  |  |  | country:US |  |
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] |  |  |  |  |  |  |  |  |  |  | PENNSYLVANIA |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to limitations on executive compensation. + References No definition available. + Details
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Namespace Prefix: | wmk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to limitations on executive compensation. + References No definition available. + Details
Name: | wmk_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLimitationsOnExecutiveCompensation
Namespace Prefix: | wmk_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration