Revenues - Major Product Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 587,175	$ 605,565
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	326,527	349,124
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	260,648	256,441
Cable & Connectivity
Disaggregation of Revenue [Line Items]
Revenues	392,179	397,197
Cable & Connectivity | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	233,671	234,467
Cable & Connectivity | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	158,508	162,730
Networking, Software & Security
Disaggregation of Revenue [Line Items]
Revenues	194,996	208,368
Networking, Software & Security | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	92,856	114,657
Networking, Software & Security | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 102,140	$ 93,711