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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.