DERIVATIVE FINANCIAL INSTRUMENTS (Schedule of Cash Flow Hedges Included in AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Loss on Derivative	$ 3,719	$ (2,106)	$ 817
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Loss on Derivative	3,664	(2,052)	829
Gain (Loss) Reclassified from AOCI into Income	2,664	(383)	(348)
Cash Flow Hedging | Designated as Hedging Instrument | Foreign currency derivatives
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Loss on Derivative	4,514	(2,052)	829
Gain (Loss) Reclassified from AOCI into Income	2,873	(383)	(348)
Cash Flow Hedging | Designated as Hedging Instrument | Interest rate swap instrument
Derivative [Line Items]
Gain (Loss) Recognized in Other Comprehensive Loss on Derivative	(850)	0	0
Gain (Loss) Reclassified from AOCI into Income	$ (209)	$ 0	$ 0