Revenues - Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 549,688	$ 533,098	$ 548,352	$ 500,140	$ 552,052	$ 554,037	$ 560,898	$ 498,715	$ 2,131,278	$ 2,165,702	$ 2,087,185
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues									1,081,232	1,095,900	1,054,847
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues									1,050,046	1,069,802	1,032,338
Products
Disaggregation of Revenue [Line Items]
Revenues									2,044,239	2,069,912	1,984,110
Products | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues									1,081,232	1,095,883	1,054,847
Products | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues									963,007	974,029	929,263
Support And Services
Disaggregation of Revenue [Line Items]
Revenues									87,039	95,790	103,075
Support And Services | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues									0	17	0
Support And Services | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues									$ 87,039	$ 95,773	$ 103,075