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Segment and Geographic Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 USD ($) number | Sep. 30, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 24, 2016 USD ($) | Jun. 25, 2016 USD ($) | Mar. 26, 2016 USD ($) | Dec. 30, 2017 USD ($) number | Dec. 31, 2016 USD ($) | Dec. 26, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | number |  |  |  |  |  |  |  |  |  | 2 |  |
Number of countries served globally | number |  | 34 |  |  |  |  |  |  |  | 34 |  |
Net sales |  | $ 3,318,054 | $ 3,161,083 | $ 3,059,458 | $ 2,922,948 | $ 3,120,934 | $ 2,865,148 | $ 2,872,630 | $ 2,712,956 | $ 12,461,543 | $ 11,571,668 | $ 10,629,719
Operating income |  | 241,191 | $ 213,548 | $ 210,662 | $ 193,968 | 213,982 | $ 200,721 | $ 180,677 | $ 176,194 | 859,369 | 771,574 | 733,972
Income before taxes, equity in earnings of affiliates and loss on sale of equity investment |  |  |  |  |  |  |  |  |  | 822,848 | 755,835 | 720,758
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 193,072 | 169,780 | 159,127
Income taxes |  |  |  |  |  |  |  |  |  | 362,506 | 217,958 | 211,391
Interest income |  |  |  |  |  |  |  |  |  | 17,553 | 13,275 | 12,935
Interest expense |  |  |  |  |  |  |  |  |  | 53,654 | 31,893 | 26,008
Purchases of fixed assets |  |  |  |  |  |  |  |  |  | 81,501 | 70,179 | 71,684
Total assets |  | 7,811,235 |  |  |  | 6,760,396 |  |  |  | 7,811,235 | 6,760,396 | 6,534,740
Health Care Distribution [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [1] |  |  |  |  |  |  |  |  | 12,023,442 | 11,146,055 | 10,270,946
Operating income |  |  |  |  |  |  |  |  |  | 728,520 | 652,106 | 626,574
Income before taxes, equity in earnings of affiliates and loss on sale of equity investment |  |  |  |  |  |  |  |  |  | 696,453 | 640,184 | 617,582
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 168,186 | 146,276 | 141,184
Income taxes |  |  |  |  |  |  |  |  |  | 325,302 | 185,571 | 180,133
Interest income |  |  |  |  |  |  |  |  |  | 17,318 | 13,086 | 12,833
Interest expense |  |  |  |  |  |  |  |  |  | 53,607 | 31,845 | 25,926
Purchases of fixed assets |  |  |  |  |  |  |  |  |  | 76,449 | 66,611 | 68,235
Total assets |  | 7,345,418 |  |  |  | 6,324,735 |  |  |  | 7,345,418 | 6,324,735 | 6,159,285
Health Care Distribution [Member] | Dental [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 6,048,813 | 5,555,299 | 5,276,407
Health Care Distribution [Member] | Animal Health [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 3,476,635 | 3,253,095 | 2,921,624
Health Care Distribution [Member] | Medical [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  | 2,497,994 | 2,337,661 | 2,072,915
Technology and Value-Added Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [2] |  |  |  |  |  |  |  |  | 438,101 | 425,613 | 358,773
Operating income |  |  |  |  |  |  |  |  |  | 130,849 | 119,468 | 107,398
Income before taxes, equity in earnings of affiliates and loss on sale of equity investment |  |  |  |  |  |  |  |  |  | 126,395 | 115,651 | 103,176
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 24,886 | 23,504 | 17,943
Income taxes |  |  |  |  |  |  |  |  |  | 37,204 | 32,387 | 31,258
Interest income |  |  |  |  |  |  |  |  |  | 235 | 189 | 102
Interest expense |  |  |  |  |  |  |  |  |  | 47 | 48 | 82
Purchases of fixed assets |  |  |  |  |  |  |  |  |  | 5,052 | 3,568 | 3,449
Total assets |  | $ 465,817 |  |  |  | $ 435,661 |  |  |  | $ 465,817 | $ 435,661 | $ 375,455
[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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