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Business Acquisitions and Planned Divestiture (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) | Apr. 23, 2018 USD ($) Individuals $ / shares | Sep. 29, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) | Sep. 29, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) | Dec. 30, 2017 USD ($) $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  | $ 3,279,678 | $ 3,161,083 | $ 9,826,793 | $ 9,143,489 |
Business acquisition allocated initial goodwill amount |  |  |  | $ 2,685,681 |  | $ 2,685,681 |  | $ 2,301,331
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Technology and Value-Added Services [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues | [1] |  |  | $ 143,903 | $ 109,012 | $ 370,183 | $ 323,510 |
Henry Schein One [Member] | Technology and Value-Added Services [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition allocated initial goodwill amount |  | $ 412,800 |  |  |  |  |  |
Scenario, Plan [Member] | Vets First Corp [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from dividends received |  |  | $ 1,000,000 |  |  |  |  |
Scenario, Plan [Member] | Vets First Corp [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from dividends received |  |  | $ 1,250,000 |  |  |  |  |
Scenario, Plan [Member] | Henry Schein One [Member] | HS Spinco, Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  |  |  |  |
Pro Forma [Member] | Henry Schein One [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | $ 400,000
Pro Forma [Member] | Henry Schein One [Member] | Internet Brands Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  | $ 100,000
Henry Schein Inc, and certain minority holders, if applicable [Member] | Henry Schein One [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 74.00% |  |  |  |  |  |
Henry Schein Inc, and certain minority holders, if applicable [Member] | Henry Schein One [Member] | Internet Brands Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 26.00% |  |  |  |  |  |
Henry Schein Inc, and certain minority holders, if applicable [Member] | Scenario, Plan [Member] | Vets First Corp [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of individuals nominated to board of directors | Individuals |  |  | 6 |  |  |  |  |
Henry Schein Inc, and certain minority holders, if applicable [Member] | Scenario, Plan [Member] | Henry Schein One [Member] | Internet Brands Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage increase, second through fifth anniversary |  | 7.60% |  |  |  |  |  |
Noncontrolling interest, ownership percentage maximum additional increase, contingency |  | 1.60% |  |  |  |  |  |
Direct Vet Marketing [Member] | Scenario, Plan [Member] | Vets First Corp [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 37.00% |  |  |  |  |
Number of individuals nominated to board of directors | Individuals |  |  | 5 |  |  |  |  |
HS Spinco, Inc [Member] | Scenario, Plan [Member] | Vets First Corp [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 63.00% |  |  |  |  |
[1] | 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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