Reclassifications (Details) (USD $) In Millions, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Reclassifications
SERP investment	$ 8.8	$ 7.1

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