PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 25, 2017	Jun. 28, 2015	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation expense			$ 245,400	$ 210,500	$ 161,700
Expenditures for capital projects			339,872	340,960	190,262
Completed projects transferred from construction-in-progress to depreciable assets			411,800	269,600
Proceeds from property disposals			4,475	13,375	$ 14,610
Gain (loss) on property disposals			500	8,900
Assets held for sale			708	$ 5,259
Impairment charges, assets held for sale		$ 4,800
Discontinued Operations, Held-for-sale | Alabama Processing Plant
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges, assets held for sale	$ 3,500		3,500
Discontinued Operations, Held-for-sale | Dublin Processing Plant
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charges, assets held for sale			1,500
United States
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Idled assets property, plant and equipment, net			48,600
Idled asset property, plant and equipment gross			166,700
Idled asset accumulated depreciation			118,100
U.K. and Europe
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Idled assets property, plant and equipment, net			2,900
Idled asset property, plant and equipment gross			11,400
Idled asset accumulated depreciation			$ 8,500