Segment Information (Sales By Product Group Information) (Details)	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Revenue from External Customer [Line Items]
Sales	100.00%	100.00%	100.00%
Supplies (Member)
Revenue from External Customer [Line Items]
Sales	65.10%	65.20%	66.40%
Technology [Member]
Revenue from External Customer [Line Items]
Sales	21.90%	22.40%	22.20%
Furniture And Other [Member]
Revenue from External Customer [Line Items]
Sales	13.00%	12.40%	11.40%