Segment Information (Analysis Of Operations By Segment) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 24, 2011	Sep. 25, 2010
Sales	$ 1,774,767	$ 1,813,366	$ 5,285,384	$ 5,383,794
Other operating, income (expense)			13,916	11,348
Operating income (loss)	41,296	40,924	73,929	118,389
Contract [Member]
Sales	883,300	877,262	2,689,305	2,720,788
Segment income (loss)	23,277	19,541	49,707	72,700
Other operating, income (expense)			(8,058)	(861)
Operating income (loss)	23,277	19,541	41,649	71,839
Retail [Member]
Sales	891,467	936,104	2,596,079	2,663,006
Segment income (loss)	28,499	32,399	62,088	85,049
Other operating, income (expense)			(5,858)	(14,450)
Operating income (loss)	28,499	32,399	56,230	70,599
Corporate And Other [Member]
Sales
Segment income (loss)	(10,480)	(11,016)	(23,950)	(28,012)
Other operating, income (expense)				3,963
Operating income (loss)	(10,480)	(11,016)	(23,950)	(24,049)
Reportable Segment [Member]
Sales	1,774,767	1,813,366	5,285,384	5,383,794
Segment income (loss)	41,296	40,924	87,845	129,737
Other operating, income (expense)			(13,916)	(11,348)
Operating income (loss)	$ 41,296	$ 40,924	$ 73,929	$ 118,389