PENSION AND OTHER POSTRETIREMENT BENEFITS (Schedule of Defined Benefit Plan Obligations and Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019	Mar. 29, 2020	Dec. 29, 2019	Mar. 31, 2019
Change in plan assets:
Fair value of plan assets, beginning of period			$ 294,589
Fair value of plan assets, end of period	$ 269,474		269,474
Pension Benefits
Change in projected benefit obligation:
Projected benefit obligation, beginning of period			369,066	$ 157,619
Interest cost	2,011	$ 1,467	4,050	2,934
Actuarial losses			28,806	13,734
Benefits paid			(9,965)	(3,020)
Curtailments and settlements			0	(5,718)
Other			11	0
Currency translation gain			(11,001)	0
Projected benefit obligation, end of period	380,967	165,549	380,967	165,549
Change in plan assets:
Fair value of plan assets, beginning of period			294,589	102,414
Actual return on plan assets			(9,948)	12,504
Contributions by employer			5,173	3,924
Benefits paid			(9,965)	(3,020)
Other			(526)	0
Currency translation loss			(9,849)	0
Fair value of plan assets, end of period	269,474	110,104	269,474	110,104
Funded status:
Unfunded benefit obligation, end of period	(111,493)		(111,493)			$ (74,477)
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:
Current liability	(9,356)		(9,356)			(14,967)
Long-term liability	(102,137)		(102,137)			(59,510)
Recognized liability	(111,493)		(111,493)			(74,477)
Amounts recognized in accumulated other comprehensive loss at end of period:
Net actuarial loss	102,530	55,685	102,530	55,685	$ 58,239	58,239	$ 54,343
Other Benefits
Change in projected benefit obligation:
Projected benefit obligation, beginning of period			1,527	1,462
Interest cost	9	13	18	26
Actuarial losses			64	96
Benefits paid			(80)	(74)
Curtailments and settlements			0	0
Other			0	0
Currency translation gain			0	0
Projected benefit obligation, end of period	1,529	1,510	1,529	1,510
Change in plan assets:
Fair value of plan assets, beginning of period			0	0
Actual return on plan assets			0	0
Contributions by employer			80	74
Benefits paid			(80)	(74)
Other			0	0
Currency translation loss			0	0
Fair value of plan assets, end of period	0	0	0	0
Funded status:
Unfunded benefit obligation, end of period	(1,529)		(1,529)			(1,527)
Amounts recognized in the Condensed Consolidated Balance Sheets at end of period:
Current liability	(157)		(157)			(158)
Long-term liability	(1,372)		(1,372)			(1,369)
Recognized liability	(1,529)		(1,529)			(1,527)
Amounts recognized in accumulated other comprehensive loss at end of period:
Net actuarial loss	$ 155	$ 62	$ 155	$ 62	$ 91	$ 91	$ (34)