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Revenues - Products and Services (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
Products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 611,967 | 577,594 | 1,804,202 | 1,651,976
Products | Enterprise Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 368,389 | 342,216 | 1,080,549 | 968,855
Products | Industrial Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 243,578 | 235,378 | 723,653 | 683,121
Support & Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43,807 | 44,151 | 125,776 | 131,783
Support & Services | Enterprise Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20,462 | 18,626 | 54,327 | 55,069
Support & Services | Industrial Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 23,345 | $ 25,525 | $ 71,449 | $ 76,714

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