Revenues - Major Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 668,639	$ 610,633	$ 1,274,204	$ 1,162,014
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	396,893	348,804	746,025	663,082
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	271,746	261,829	528,179	498,932
Cable & Connectivity
Disaggregation of Revenue [Line Items]
Revenues	452,447	414,390	849,644	794,882
Cable & Connectivity | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	279,567	255,066	514,042	489,247
Cable & Connectivity | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	172,880	159,324	335,602	305,635
Networking, Software & Security
Disaggregation of Revenue [Line Items]
Revenues	216,192	196,243	424,560	367,132
Networking, Software & Security | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	117,326	93,738	231,983	173,835
Networking, Software & Security | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 98,866	$ 102,505	$ 192,577	$ 193,297