Restructuring Activities - Restructuring Plan Reserve Recorded in Accrued Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Restructuring Reserve [Roll Forward]
Balance, beginning of period	$ 3,330	$ 39,568	$ 23,920	$ 0
Restructuring (benefit) expense	615	43,915	1,167	85,864
Utilized – cash	(1,594)	(17,839)	(22,730)	(17,839)
Utilized – non cash	27	(16,000)	278	(18,358)
Foreign currency changes	(28)	112	(285)	89
Balance, end of period	2,350	49,756	2,350	49,756
Employee Termination Benefits
Restructuring Reserve [Roll Forward]
Balance, beginning of period	1,246	25,298	7,724	0
Restructuring (benefit) expense	(165)	4,493	(1,131)	29,814
Utilized – cash	(397)	(11,940)	(5,743)	(11,940)
Utilized – non cash	0	0	0	0
Foreign currency changes	(7)	166	(173)	143
Balance, end of period	677	18,017	677	18,017
Contract Terminations & Other
Restructuring Reserve [Roll Forward]
Balance, beginning of period	2,084	14,270	16,196	0
Restructuring (benefit) expense	807	23,422	2,576	37,692
Utilized – cash	(1,197)	(5,899)	(16,987)	(5,899)
Utilized – non cash	0	0	0	0
Foreign currency changes	(21)	(54)	(112)	(54)
Balance, end of period	1,673	31,739	1,673	31,739
Non-Current Asset Adjustments
Restructuring Reserve [Roll Forward]
Balance, beginning of period	0	0	0	0
Restructuring (benefit) expense	(27)	16,000	(278)	18,358
Utilized – cash	0	0	0	0
Utilized – non cash	27	(16,000)	278	(18,358)
Foreign currency changes	0	0	0	0
Balance, end of period	$ 0	$ 0	$ 0	$ 0