INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 29, 2019	Dec. 30, 2018
Deferred tax liabilities:
PP&E and identified intangible assets	$ 290,427	$ 217,353
Inventories	81,469	69,464
Insurance claims and losses	31,642	29,964
Business combinations	47,450	46,779
Incentive compensation	12,860	11,838
Operating lease assets	68,846	0
Other	14,267	11,596
Total deferred tax liabilities	546,961	386,994
Deferred tax assets:
Net operating losses	3,120	2,923
Foreign net operating losses	50,806	38,531
Credit carry forwards	15,575	14,461
Allowance for doubtful accounts	5,429	6,788
Accrued liabilities	51,148	60,572
Workers compensation	36,147	25,297
Pension and other postretirement benefits	29,429	28,266
Operating lease liabilities	68,846	0
Other	22,502	3,133
Total deferred tax assets	283,002	179,971
Valuation allowance	(33,522)	(26,150)
Net deferred tax assets	249,480	153,821
Net deferred tax liabilities	$ 297,481	$ 233,173