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Employee Benefit Plans - Other Employee Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 26, 2015
Management [Member] | Deferred compensation bonus and commission plan [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Deferred compensation plan fair market value amount charged (credited) to operations $ 5.0 $ 1.7 $ 0.1
Qualified 401K plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Amounts charged (credited) to operations $ 39.0 33.9 31.5
Qualified 401K plan [Member] | Maximum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Maximum matching contributions as a percentage of participants' contributions (as a percent) 100.00%    
Maximum participants' contributions as a percentage of their base compensation (as a percent) 7.00%    
Allowable maximum percentage of contributions allocated to Henry Schein Stock Fund (as a percent) 20.00%    
Supplemental executive retirement plan [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Amounts charged (credited) to operations $ 0.6 $ 0.3 $ 1.5