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SUBSEQUENT EVENTS (Details)			1 Months Ended
SUBSEQUENT EVENTS (Details)	Apr. 27, 2020 USD ($)	Apr. 21, 2020 USD ($) shares	May 31, 2020 USD ($)	Apr. 29, 2020 Shack	Apr. 10, 2020 USD ($)	Mar. 25, 2020 Shack
Class A Common Stock \| ATM Program \| Subsequent Event
Subsequent Event [Line Items]
Sale of stock, maximum offering price		$ 75,000,000
Sale of stock, number of shares issued in transaction (in shares) \| shares		233,467
Proceeds from sale of stock		$ 9,794,000
Class A Common Stock \| Over-Allotment Option \| Subsequent Event
Subsequent Event [Line Items]
Sale of stock, number of shares issued in transaction (in shares) \| shares		3,416,070
Proceeds from sale of stock		$ 135,857,000
Notes Payable to Banks \| Subsequent Event
Subsequent Event [Line Items]
Proceeds from bank debt					$ 10,000,000
Repayments of bank debt	$ 10,005,000
First Amendment to the Credit Agreement \| Line of credit \| Subsequent Event
Subsequent Event [Line Items]
Debt instrument, minimum required liquidity			$ 25,000,000
First Amendment to the Credit Agreement \| Minimum \| Line of credit \| London Interbank Offered Rate (LIBOR) \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate			1.00%
First Amendment to the Credit Agreement \| Minimum \| Line of credit \| Prime rate \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate			0.00%
First Amendment to the Credit Agreement \| Maximum \| Line of credit \| London Interbank Offered Rate (LIBOR) \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate			2.50%
First Amendment to the Credit Agreement \| Maximum \| Line of credit \| Prime rate \| Subsequent Event
Subsequent Event [Line Items]
Basis spread on variable rate			1.50%
Licensed \| UNITED STATES
Subsequent Event [Line Items]
Number of Shacks closed \| Shack						37
Licensed \| UNITED STATES \| Subsequent Event
Subsequent Event [Line Items]
Number of Shacks closed \| Shack				17
Company-operated \| Subsequent Event
Subsequent Event [Line Items]
Number of Shacks closed \| Shack				61
Number of Shacks \| Shack				120
Company-operated \| UNITED STATES
Subsequent Event [Line Items]
Number of Shacks closed \| Shack						12