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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2018
Dec. 30, 2017
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]          
Effective tax rate (in hundredths)       23.30% 26.30%
Unrecognized tax benefits $ 104,600     $ 104,600  
Unrecognized tax benefits that would affect the effective tax rate if recognized 83,000     83,000  
Total interest 15,300     15,300  
Total penalties 0     $ 0  
Other Information Pertaining to Income Taxes       In 2016, we reached a settlement on a portion of the IRS audit of tax years 2012 and 2013, and we filed a Mutual Agreement Procedure request with the IRS for assistance from the U.S. Competent Authority for an open Transfer Pricing issue which resulted in a partial settlement during the quarter ended December 30, 2017. During the quarter ended June 30, 2017, we filed a protest with the Appellate Division regarding the remaining open audit issues for the years 2012 and 2013. We had an initial Appeals Conference during the third quarter of 2018. In addition, we are working on finalizing our submission for an Advanced Pricing Agreement pursuant to which Henry Schein, Inc. and the IRS would agree on an appropriate transfer pricing methodology for future tax years. We do not expect this to have a material effect on our consolidated financial position, liquidity or results of operations.  
Income Tax Examination [Line Items]          
Income Tax Expense (Benefit) $ 29,401   $ 59,340 $ 124,084 $ 156,276
Provision for transitional tax   $ 140,000      
Revaluation of deferred tax assets and liabilities   $ 3,000      
Tax Cuts and Jobs Act, Incomplete Accounting, Provisional Income Tax (Benefit)       10,000  
Tax Cuts and Jobs Act, revaluation of deferred tax asset (liability)       1,500  
Accounting Standards Update 2016-09 [Member]          
Income Tax Examination [Line Items]          
Income Tax Expense (Benefit)       $ (1,000) $ (19,500)