Goodwill and Intangible Assets, net - Intangible Assets, net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 417,400				$ 305,500
Accumulated Amortization	(159,190)				(125,036)
Total	258,210	$ 156,323	$ 164,370	$ 172,417	180,464
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	390,900				286,900
Accumulated Amortization	(149,163)				(116,923)
Total	241,737				169,977
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,700				1,700
Accumulated Amortization	(1,700)				(1,700)
Total	0				0
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,800				16,900
Accumulated Amortization	(8,327)				(6,413)
Total	$ 16,473				$ 10,487