INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 25, 2016	Dec. 27, 2015
Deferred tax liabilities:
PP&E and identified intangible assets	$ 182,433	$ 151,761
Inventories	93,114	97,743
Insurance claims and losses	42,186	39,800
Other	6,252	15,054
Total deferred tax liabilities	323,985	304,358
Deferred tax assets:
Net operating losses	3,396	4,297
Foreign net operating losses	13,446	16,595
Credit carry forwards	2,080	2,638
Allowance for doubtful accounts	4,274	4,382
Accrued liabilities	57,567	56,753
Workers compensation	38,834	41,217
Pension and other postretirement benefits	21,903	22,559
Other	46,066	31,956
Total deferred tax assets	187,566	180,397
Valuation allowance	(6,232)	(7,921)
Net deferred tax assets	181,334	172,476
Net deferred tax liabilities	$ 142,651	$ 131,882