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Reorganization and Realignment Costs Operations and Field Realignment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 3,375	$ 403	$ 10,196	$ 4,771
Operations and Field Realignment
Restructuring Cost and Reserve
Reorganization and realignment costs	3,021	$ 0	3,021	$ 0
Operations and Field Realignment \| Minimum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	7,000		7,000
Operations and Field Realignment \| Maximum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	9,000		9,000
Operations and Field Realignment \| Third-party and other costs \| Minimum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	4,000		4,000
Operations and Field Realignment \| Third-party and other costs \| Maximum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost Remaining	6,000		6,000
Operations and Field Realignment \| Severance and related employee costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	2,502		$ 2,502
Operations and Field Realignment \| Share based compensation
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	$ 519