STOCKHOLDERS' EQUITY (Schedule of Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	$ 2,536,060	$ 2,019,585	$ 1,855,661
Other comprehensive income (loss) before reclassifications	56,044	51,851
Amounts reclassified from accumulated other comprehensive loss to net income	(1,591)	908
Currency translation	56	(54)
Total other comprehensive income (loss), net of tax	54,509	52,705	(96,694)
Balance, end of year	2,575,347	2,536,060	2,019,585
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(75,129)	(127,834)	(31,140)
Total other comprehensive income (loss), net of tax	54,509	52,705	(96,694)
Balance, end of year	(20,620)	(75,129)	(127,834)
Gains (Losses) Related to Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(1,108)	(55,770)
Other comprehensive income (loss) before reclassifications	83,890	54,662
Amounts reclassified from accumulated other comprehensive loss to net income	0	0
Currency translation	0	0
Total other comprehensive income (loss), net of tax	83,890	54,662
Balance, end of year	82,782	(1,108)	(55,770)
Unrealized Losses on Derivative Financial Instruments Classified as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(2,406)	(683)
Other comprehensive income (loss) before reclassifications	3,823	(2,052)
Amounts reclassified from accumulated other comprehensive loss to net income	(2,664)	383
Currency translation	56	(54)
Total other comprehensive income (loss), net of tax	1,215	(1,723)
Balance, end of year	(1,191)	(2,406)	(683)
Losses Related to Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	(71,615)	(71,463)
Other comprehensive income (loss) before reclassifications	(31,724)	(1,145)
Amounts reclassified from accumulated other comprehensive loss to net income	1,128	993
Currency translation	0	0
Total other comprehensive income (loss), net of tax	(30,596)	(152)
Balance, end of year	(102,211)	(71,615)	(71,463)
Unrealized Holding Gains on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of year	0	82
Other comprehensive income (loss) before reclassifications	55	386
Amounts reclassified from accumulated other comprehensive loss to net income	(55)	(468)
Currency translation	0	0
Total other comprehensive income (loss), net of tax	0	(82)
Balance, end of year	$ 0	$ 0	$ 82