EMPLOYEE BENEFIT PLANS - Reconciliation of Benefit Obligations and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Change in projected benefit obligations:
Benefit obligation at beginning of year	$ 362,805	$ 392,964
Service cost	2,833	2,612	$ 3,110
Interest cost	11,583	10,850	11,642
Other	850	1,499
Benefit payments	(11,062)	(8,886)
Settlements	(74)	0
Special/Contractual Termination Benefits	166	0
Plan amendments	0	104
Transfer in from acquisition	6,818	0
Actuarial loss (gain)	66,432	(21,168)
Administrative expenses paid	(470)	(195)
Effect of foreign exchange	7,528	(14,975)
Benefit obligation at end of year	447,409	362,805	392,964
Change in fair value of plan assets:
Fair value of plan assets at beginning of year	305,709	304,325
Actual return on plan assets	53,741	(7,419)
Employer contributions	2,105	31,174
Settlements	(74)	0
Transfer in from acquisition	119	0
Benefit payments	(11,062)	(8,886)
Administrative expenses paid	(470)	(195)
Effect of foreign exchange	7,113	(13,290)
Fair value of plan assets at end of year	357,181	305,709	$ 304,325
Net balance sheet liability	90,228	57,096
Amounts recognized in balance sheet:
Noncurrent assets	1,742	3,280
Current liabilities	12,788	1,095
Noncurrent liabilities	$ 79,182	$ 59,281