Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jul. 03, 2021	Apr. 03, 2021	Jul. 04, 2020	Apr. 04, 2020	Jul. 03, 2021	Jul. 04, 2020
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance		$ 13,559			$ 13,559
Other comprehensive income before reclassifications					(17,664)
Tax effect					0
Other comprehensive income before reclassifications, net of tax					(17,664)
Amounts reclassified out of AOCI					5,323
Tax effect					(1,439)
Amounts reclassified out of AOCI, net of tax					3,884
Net other comprehensive income	$ 11,305	(25,085)	$ 21,848	$ (21,528)	(13,780)	$ 320
Ending Balance	(221)				(221)
Pension and Other Post-Retirement Actuarial Items [Member]
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance		(77,075)			(77,075)
Other comprehensive income before reclassifications					0
Tax effect					0
Other comprehensive income before reclassifications, net of tax					0
Amounts reclassified out of AOCI					5,323
Tax effect					(1,439)
Amounts reclassified out of AOCI, net of tax					3,884
Net other comprehensive income					3,884
Ending Balance	(73,191)				(73,191)
Currency Translation Adjustment [Member]
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance		90,634			90,634
Other comprehensive income before reclassifications					(17,664)
Tax effect					0
Other comprehensive income before reclassifications, net of tax					(17,664)
Amounts reclassified out of AOCI					0
Tax effect					0
Amounts reclassified out of AOCI, net of tax					0
Net other comprehensive income					(17,664)
Ending Balance	72,970				72,970
Accumulated Other Comprehensive Income (Loss) [Member]
Cumulative balance of each component of other comprehensive income (loss) and income tax effects [Roll Forward]
Beginning Balance		13,559			13,559
Net other comprehensive income	11,305	$ (25,085)	$ 21,848	$ (21,528)
Ending Balance	$ (221)				$ (221)