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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Supplemental Cash Flow Information [Abstract] |  |  |  |
Interest |  |  | $ 52,108 | $ 33,640
Income taxes |  |  | 207,474 | 179,445
Unrealized gain (loss) from foreign currency hedging activities | $ (406) | $ 26 | $ 1,079 | $ (1,278)
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |
Business Acquisition, non-cash transaction | 1,300 |  |  |
Henry Schein One [Member] | Scenario, Plan [Member] | Internet Brands Inc [Member] |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |
Business Acquisition, non-cash transaction | $ 337,000 |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 26.00% |  | 26.00% |
Henry Schein One [Member] | Scenario, Plan [Member] | Internet Brands Inc [Member] | Internet Brands Inc [Member] |  |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |  |
Business Acquisition, non-cash transaction | $ 95,000 |  |  |
Noncash or Part Noncash Acquisition, Interest Acquired | 9.20% |  |  |

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