Revenues - Major Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 655,774	$ 621,745	$ 1,929,978	$ 1,783,759
Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	388,851	360,842	1,134,876	1,023,924
Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	266,923	260,903	795,102	759,835
Cable & Connectivity
Disaggregation of Revenue [Line Items]
Revenues	434,388	422,732	1,284,032	1,217,614
Cable & Connectivity | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	271,928	262,212	785,970	751,459
Cable & Connectivity | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	162,460	160,520	498,062	466,155
Networking, Software & Security
Disaggregation of Revenue [Line Items]
Revenues	221,386	199,013	645,946	566,145
Networking, Software & Security | Enterprise Solutions
Disaggregation of Revenue [Line Items]
Revenues	116,923	98,630	348,906	272,465
Networking, Software & Security | Industrial Solutions
Disaggregation of Revenue [Line Items]
Revenues	$ 104,463	$ 100,383	$ 297,040	$ 293,680