PROPERTY, PLANT AND EQUIPMENT (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 25, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,665,472	$ 4,219,546
Accumulated depreciation	(2,570,325)	(2,385,561)
Property, plant and equipment, net	2,095,147	1,833,985
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	205,087	150,127
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,681,610	1,487,353
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,533,522	2,268,526
Autos and trucks
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	58,159	58,454
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 187,094	$ 255,086