Summary of Significant Accounting Policies - Rental and Commission Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Accounting Policies [Abstract]
Commission income	$ 18.9	$ 17.7	$ 18.3

Primarily represents commissions incurred in the period based upon the sale by commissioned employees or third parties of the entity's goods or services, and fees for sales assistance or product enhancements performed by third parties (such as a distributor or value added reseller), net of commission income.

No definition available.

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