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Acquisition of Petsense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2016
Dec. 31, 2016
Dec. 26, 2015
Business Acquisition [Line Items]      
Business Acquisition, Effective Date of Acquisition Sep. 29, 2016    
Current Assets $ 21,875    
Property and Equipment 25,519    
Other intangible assets - tradename 31,300    
Other Assets 428    
Current Liabilities (12,091)    
Long-term liabilities (5,489)    
Total identifiable net assets acquired 61,542    
Excess of consideration transferred over identifiable net assets acquired (goodwill) 84,159    
Consideration Transferred 145,701    
Goodwill, Acquired During Period 84,200 $ 84,159 $ 0
Indefinite-lived Intangible Assets Acquired 31,300    
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed $ 2,800