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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)	12 Months Ended
	Dec. 26, 2018	Sep. 27, 2017	Dec. 31, 2013
Loss Contingencies [Line Items]
Percentage of tax benefits due to equity owners	85.00%
Establishment of tax receivable agreement liability	$ 203,725,000
Retail site
Loss Contingencies [Line Items]
Letters of credit outstanding	130,000
Office building
Loss Contingencies [Line Items]
Letters of credit outstanding			$ 80,000
Home Office Lease
Loss Contingencies [Line Items]
Letters of credit outstanding		$ 603,000
Former Shake Shack Manager Litigation
Loss Contingencies [Line Items]
Settlement agreement amount funded	$ 1,200,000
IPO
Loss Contingencies [Line Items]
Percentage of tax benefits due to equity owners	85.00%

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