PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 26, 2015	Dec. 27, 2014
Long-lived assets
Property, plant and equipment, at cost	$ 1,081,056	$ 1,139,569
Land and improvements
Long-lived assets
Property, plant and equipment, at cost	79,450	82,372
Buildings and improvements
Long-lived assets
Property, plant and equipment, at cost	323,469	327,863
Machinery and equipment
Long-lived assets
Property, plant and equipment, at cost	565,771	593,387
Transportation equipment
Long-lived assets
Property, plant and equipment, at cost	17,774	35,205
Office furniture and equipment
Long-lived assets
Property, plant and equipment, at cost	77,054	76,589
Construction in progress
Long-lived assets
Property, plant and equipment, at cost	$ 17,538	$ 24,153