Operations by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 30, 2012	Jun. 25, 2011
Segment Reporting Information [Line Items]
Sales	$ 1,602,399	$ 1,647,616	$ 3,475,311	$ 3,510,617
Segment income (expense)	23,088	17,937	66,203	46,549
Other operating expense		(13,916)	(25,266)	(13,916)
Operating income (loss)	23,088	4,021	40,937	32,633
Contract
Segment Reporting Information [Line Items]
Sales	878,838	880,333	1,839,422	1,806,005
Segment income (expense)	25,704	17,425	52,791	26,430
Other operating expense		(8,058)		(8,058)
Operating income (loss)	25,704	9,367	52,791	18,372
Retail
Segment Reporting Information [Line Items]
Sales	723,561	767,283	1,635,889	1,704,612
Segment income (expense)	2,842	7,969	25,668	33,589
Other operating expense		(5,858)	(25,266)	(5,858)
Operating income (loss)	2,842	2,111	402	27,731
Corporate And Other
Segment Reporting Information [Line Items]
Segment income (expense)	(5,458)	(7,457)	(12,256)	(13,470)
Operating income (loss)	$ (5,458)	$ (7,457)	$ (12,256)	$ (13,470)