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Discontinued Operations - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 07, 2019
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Distribution received related to Animal Health Spin-off   $ 1,120,000 $ 0 $ 0
Proceeds related to Animal Health Share Sale   $ 361,090 $ 0 $ 0
Henry Schein Animal Health Business [Member] | Covetrus, Inc. [Member] | Henry Schein stockholders and the Share Sale Investors [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Noncontrolling Interest, Ownership Percentage by Parent 37.00%      
Henry Schein Animal Health Business [Member] | Covetrus, Inc. [Member] | Vets First Corp [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Distribution received related to Animal Health Spin-off $ 1,120,000      
Proceeds related to Animal Health Share Sale $ 361,100      
Noncontrolling Interest, Ownership Percentage by Parent 63.00%