Restructuring - Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 808	$ 1,259	$ 4,574	$ 2,835
Cumulative To Date	83,296		83,296
January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	(41)	0	3,643	0
Cumulative To Date	3,643		3,643
December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	847	1,249	931	2,888
Cumulative To Date	11,011		11,011
Other Legacy Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	2	10	0	(53)
Cumulative To Date	68,642		68,642
Severance and benefits | January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	(63)	0	3,608	0
Cumulative To Date	3,608		3,608
Severance and benefits | December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	847	1,249	819	2,888
Cumulative To Date	10,852		10,852
Other costs | January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	22	0	35	0
Cumulative To Date	35		35
Other costs | December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	0	$ 0	112	$ 0
Cumulative To Date	$ 159		$ 159