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Segment Data (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2016 USD ($) number | Sep. 26, 2015 USD ($) | Sep. 24, 2016 USD ($) number | Sep. 26, 2015 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | number |  |  |  | 2 |
Number of countries served globally | number |  | 33 |  | 33 |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | $ 2,865,148 | $ 2,685,835 | $ 8,450,734 | $ 7,778,801
Operating income |  | 200,721 | 188,882 | 557,592 | 533,279
Health Care Distribution [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 2,760,452 | 2,596,097 | 8,137,348 | 7,513,847
Operating income |  | 170,158 | 161,702 | 468,610 | 454,009
Health Care Distribution [Member] | Dental [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 1,330,525 | 1,266,321 | 4,005,468 | 3,837,137
Health Care Distribution [Member] | Animal Health [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 790,279 | 732,533 | 2,415,290 | 2,165,415
Health Care Distribution [Member] | Medical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 639,648 | 597,243 | 1,716,590 | 1,511,295
Technology and Value-Added Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [2] | 104,696 | 89,738 | 313,386 | 264,954
Operating income |  | $ 30,563 | $ 27,180 | $ 88,982 | $ 79,270
[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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