Retirement Plans - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 28, 2024	Dec. 30, 2023
Retirement Plans
Employer matching contribution per dollar	$ 0.5
Employer contribution matching, percentage	6.00%
Vesting percentage	100.00%
Service period to be fully vested	3 years
Retirement Plans, Accumulated Benefit Obligation	$ 31,100,000	$ 26,700,000
Benefit payment	1,000,000
Liability reversed	$ 2,400,000

Amount of distribution made to individual in accordance with deferred compensation arrangement.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482943/710-10-55-7

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

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Period Type:	duration

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer's matching contributions to a defined contribution plan that vests in a given year.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of reversal of recorded liability pertaining to deferred compensation arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	wmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount per dollar of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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

- 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 deferred compensation plan for pharmacists , which are recognized in the balance sheet as a noncurrent liability. Both the SERP and the deferred compensation plan for pharmacists 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