DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Derivative [Line Items]
Net gains (losses) on derivative financial instruments	$ 6,700	$ (4,300)	$ 21,600
Deferred net gain on derivatives expected to be reclassified from AOCI to net income over the next 12 months	500
Gains (losses) arising during the period	100,081	$ (233,232)	$ (32,482)
JBS SA
Derivative [Line Items]
Gains (losses) arising during the period	$ (16,700)