PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 30, 2012	Dec. 25, 2011
Land	$ 63,788	$ 65,413
Buildings	1,081,059	1,077,789
Machinery and equipment	1,498,280	1,492,251
Autos and trucks	58,526	58,518
Construction-in-progress	47,927	36,094
Property, plant and equipment, gross	2,749,580	2,730,065
Accumulated depreciation	(1,559,659)	(1,488,313)
Property, plant and equipment, net	$ 1,189,921	$ 1,241,752