Reorganization and Realignment Costs IT Realignment Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 2,911	$ 3,570	$ 6,821	$ 4,368
IT Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	1,000		1,000
Restructuring and Related Cost, Incurred Cost	2,847		6,406
Restructuring and Related Cost, Cost Incurred to Date	15,340		15,340
Reorganization and realignment costs	2,847	$ 0	6,406	$ 0
Restructuring Charges, Incurred to Date	15,533		15,533
IT Realignment | Severance and related employee costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	830		975
Restructuring and Related Cost, Cost Incurred to Date	8,523		8,523
IT Realignment | Recruitment and relocation costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	143		314
Restructuring and Related Cost, Cost Incurred to Date	314		314
IT Realignment | Third-party and other costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	1,874		5,117
Restructuring and Related Cost, Cost Incurred to Date	6,503		6,503
IT Realignment | Share based compensation
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	0		0
Restructuring and Related Cost, Cost Incurred to Date	193		193
IT Realignment | Minimum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	16,000		16,000
IT Realignment | Maximum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	$ 17,000		$ 17,000