Revenues - Major Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 637,530	$ 668,639	$ 1,224,705	$ 1,274,204
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	369,862	396,893	696,389	746,025
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	267,668	271,746	528,316	528,179
Cable & Connectivity
Disaggregation of Revenue [Line Items]
Revenues	435,503	452,447	827,682	849,644
Cable & Connectivity | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	268,382	279,567	502,053	514,042
Cable & Connectivity | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	167,121	172,880	325,629	335,602
Networking, Software & Security
Disaggregation of Revenue [Line Items]
Revenues	202,027	216,192	397,023	424,560
Networking, Software & Security | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	101,480	117,326	194,336	231,983
Networking, Software & Security | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 100,547	$ 98,866	$ 202,687	$ 192,577