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Revenues - Products and Services (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 01, 2018 | Apr. 02, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 605,565 | $ 551,381
Enterprise Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 349,124 | 314,278
Industrial Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 256,441 | 237,103
Products |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 556,396 | 496,418
Products | Enterprise Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 331,749 | 293,499
Products | Industrial Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 224,647 | 202,919
Support & Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 49,169 | 54,963
Support & Services | Enterprise Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,375 | 20,779
Support & Services | Industrial Solutions |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 31,794 | $ 34,184

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