Acquisition of Business (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 29, 2012	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Sales Revenue, Goods, Net	$ 686,392	$ 661,412	$ 662,072	$ 682,712	$ 694,307	$ 668,391	$ 677,097	$ 661,610	$ 2,692,588	$ 2,701,405	$ 2,752,504
Purchase price									0	6,116	0
Business Combination, Bargain Purchase, Gain Recognized, Amount									0	414	0
Former Genuardi's Stores [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition									Jun. 11, 2012
Sales Revenue, Goods, Net										$ 22,100
Number of stores acquired									3