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COMMITMENTS AND CONTINGENCIES (Details)
$ in Thousands
1 Months Ended 9 Months Ended
May 01, 2017
USD ($)
Nov. 30, 2015
USD ($)
manager
Sep. 27, 2017
USD ($)
Sep. 28, 2016
USD ($)
Dec. 28, 2016
USD ($)
Dec. 31, 2013
USD ($)
Loss Contingencies [Line Items]            
Document period end date     Sep. 27, 2017      
Percentage of tax benefits due to equity owners     85.00%      
Establishment of liabilities under tax receivable agreement     $ 12,918 $ 90,776    
Tax receivable agreement liability     $ 283,961   $ 272,482  
Exempt Classification Matter            
Loss Contingencies [Line Items]            
Number of former Shake Shack managers | manager   2        
Settlement amount   $ (750)        
Loss Contingency Accrual, Payments $ 774          
Letter of credit            
Loss Contingencies [Line Items]            
Renewal term     1 year      
Retail site            
Loss Contingencies [Line Items]            
Letters of credit outstanding     $ 160      
Office building            
Loss Contingencies [Line Items]            
Letters of credit outstanding     $ 603     $ 80