INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2014	Dec. 29, 2013
Deferred tax liabilities:
PP&E and identified intangible assets	$ 126,536	$ 125,197
Inventories	48,365	74,287
Insurance claims and losses	36,953	33,625
All other current	18,696	9,453
All other noncurrent	8,105	9,031
Total deferred tax liabilities	238,655	251,593
Deferred tax assets:
Net operating losses	5,842	20,907
Foreign net operating losses	7,873	15,437
Credit carry forwards	2,916	79,555
Allowance for doubtful accounts	4,261	4,510
Accrued liabilities	52,772	47,384
All other current	9,755	12,282
All other noncurrent	20,857	10,292
Workers compensation	43,309	42,951
Pension and other postretirement benefits	26,049	20,364
Total deferred tax assets	173,634	253,682
Valuation allowance	(9,150)	(10,400)
Net deferred tax assets	164,484	243,282
Net deferred tax liabilities	$ 74,171	$ 8,311