Restructuring - Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	$ (230)	$ (97)	$ 4,344	$ 2,738
Cumulative To Date	83,066		83,066
January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	(74)	0	3,569	0
Cumulative To Date	3,569		3,569
January 2021 Restructuring Plan: | Cost of Revenue
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)			2,500
December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	(26)	(104)	905	2,784
Cumulative To Date	10,985		10,985
Other Legacy Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	(130)	7	(130)	(46)
Cumulative To Date	68,512		68,512
Severance and benefits | January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	(75)	0	3,533	0
Cumulative To Date	3,533		3,533
Severance and benefits | December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	(26)	(104)	793	2,784
Cumulative To Date	10,826		10,826
Other costs | January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	1	0	36	0
Cumulative To Date	36		36
Other costs | December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Total restructuring charges (credits)	0	$ 0	112	$ 0
Cumulative To Date	$ 159		$ 159