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Segment Data (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 USD ($) number | Sep. 30, 2017 USD ($) | Sep. 29, 2018 USD ($) number | Sep. 30, 2017 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | number |  |  |  | 2 |
Number of countries served globally | number |  | 34 |  | 34 |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | $ 3,279,678 | $ 3,161,083 | $ 9,826,793 | $ 9,143,489
Operating income |  | 165,926 | 213,548 | 573,417 | 618,178
Healthcare Distribution [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 3,135,775 | 3,052,071 | 9,456,610 | 8,819,979
Operating income |  | 127,990 | 181,612 | 471,543 | 521,278
Healthcare Distribution [Member] | Dental [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 1,514,538 | 1,478,730 | 4,675,212 | 4,372,055
Healthcare Distribution [Member] | Animal Health [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 899,295 | 882,580 | 2,805,031 | 2,586,850
Healthcare Distribution [Member] | Medical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 721,942 | 690,761 | 1,976,367 | 1,861,074
Technology and Value-Added Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [2] | 143,903 | 109,012 | 370,183 | 323,510
Operating income |  | $ 37,936 | $ 31,936 | $ 101,874 | $ 96,900
[1] | Consists of consumable products, small equipment, laboratory products, large equipment, equipment repair services, branded and generic pharmaceuticals, vaccines, surgical products, diagnostic tests, infection-control products and vitamins.
[2] | Consists of practice management software and other value-added products, which are distributed primarily to health care providers, and financial services on a non-recourse basis, e-services, continuing education services for practitioners, consulting and other services.

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