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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

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