Reclassifications (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Dec. 28, 2013	Dec. 29, 2012
Reclassifications
SERP investment	$ 10,268	$ 8,752	$ 7,100

Amount of investments in level 1 mutual funds related to a non-qualified supplemental executive retirement plan and a non-qualified pharmacist deferred compensation plan for certain of its associates.

No definition available.

Name:	wmk_SerpInvestment
Namespace Prefix:	wmk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant