SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Sep. 26, 2020 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	$ 1,144,338
Balance, ending	1,162,439
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	(232,575)
Current-period comprehensive income (loss)	(17,062)
Balance, ending	(249,637)
Gain on Hedging Activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	14,076
Current-period comprehensive income (loss)	8,150
Balance, ending	22,226
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	(94,923)
Current-period comprehensive income (loss)	0
Balance, ending	(94,923)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning	(313,422)
Current-period comprehensive income (loss)	(8,912)
Balance, ending	$ (322,334)