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REVENUE - Schedule of Respective Liability Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 25, 2024
Disaggregation of Revenue [Line Items]
Gift card liability	$ 3,711	$ 2,584
Deferred revenue, current	1,928	1,666
Deferred revenue, long-term	19,154	17,060
Shack sales
Disaggregation of Revenue [Line Items]
Contract with customer, asset, net	13,397	10,699
Licensing receivables, net of allowance for doubtful accounts
Disaggregation of Revenue [Line Items]
Contract with customer, asset, net	$ 7,507	$ 5,735

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