Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 04, 2020	Sep. 29, 2019	Oct. 04, 2020	Sep. 29, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5,913	$ 26,210	$ (91,545)	$ 62,768
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment	23,402	(18,585)	24,317	(19,539)
Other Comprehensive Income (Loss), Cash Flow Hedge	864	(941)	(5,627)	(8,914)
Other Comprehensive Income (Loss), Pension Liability Adjustment	(1,471)	1,076	(80)	1,814
Comprehensive Income (Loss)	$ 28,708	$ 7,760	$ (72,935)	$ 36,129