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Segment Data (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2017 USD ($) number | Jun. 25, 2016 USD ($) | Jul. 01, 2017 USD ($) number | Jun. 25, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | number |  |  |  | 2 |
Number of countries served globally | number |  | 32 |  | 32 |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | $ 3,059,458 | $ 2,872,630 | $ 5,982,406 | $ 5,585,586
Operating income |  | 210,662 | 180,677 | 404,630 | 356,871
Health Care Distribution [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [1] | 2,950,925 | 2,765,611 | 5,767,908 | 5,376,896
Operating income |  | 176,959 | 150,351 | 339,666 | 298,452
Health Care Distribution [Member] | Dental [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 1,488,167 | 1,373,188 | 2,893,325 | 2,674,943
Health Care Distribution [Member] | Animal Health [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 891,331 | 853,598 | 1,704,270 | 1,625,011
Health Care Distribution [Member] | Medical [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales |  | 571,427 | 538,825 | 1,170,313 | 1,076,942
Technology and Value-Added Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | [2] | 108,533 | 107,019 | 214,498 | 208,690
Operating income |  | $ 33,703 | $ 30,326 | $ 64,964 | $ 58,419
[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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